Yes, this is a problem of all cryptocurrencies, but there isn't any good solution for that problem other than adding a support for some stable coin like Tether. Many exchanges do that because they don't have a bank account, which would let them accept real fiat money for cryptocurrencies. Maybe some wallets support multiple cryptocurrencies and some of them are stablecoins, but generally, if you need to interact with blockchain of any cryptocurrency, you need to use native currency. For some, it is because that is the only currency there is on that cryptocurrency platform and for others that is a only currency that miners only accept. For example, you can't send ERC20 tokens on Ethereum without paying the fees in ETH. The price volatility is because cryptocurrencies are still too small, there aren't enough people to get it more stable because there is always some people who could dump their coins at low price. Another reason for it could be that it is so easy to do with cryptocurrencies, but so much difficult to do with fiat money.
Fees on Byteball are super cheap, usually a transaction cost on Byteball is less than 1000 bytes, which costs around $0.00005. You are not betting against the bot, you are betting against other people who have offered those odds. The odds difference between what is shown on OddsChecker and BB Odds is not because bot fees, but because these are the odds that other users have offered. Also, the whole premise of blockchain is not cutting the costs, it is to get rid of the middlemen who block you from sending the money or who could deny payout to you even if you won by having the funds in smart-contract, not in hands of middleman. If you think that these odds are horrible (which they aren't) then you could offer better odds yourself, if you were sure that 2.06 was too low odd for Atlanta Braves to lose against Boston Red Sox, you could have gone to bet maker mode on BB Odds and offered the odds that you would think are fair, if you have money deposited to bot, next time anybody thinking that Atlanta Braves will win would have taken your offered bet.
Betting on Byteball has evolved a lot and what you are describing is the foundation of sports betting and how it can be done with the help of Sports Oracle bot and direct chat with somebody you know. The next layer on top of that was Sports Betting Bot, which takes care of the issue of finding the other counterpart and lets people just put up the odds and anybody could take them via the bot. It is exactly the exchange what you are describing, but it is even better because you don't have to pick any single offer with best odds, it will automatically compose you the smart-contract with the best odds depending on the amount you want to bet on. Third layer is the web interface of BB Odds, which makes using the bot even easier because you can see all the bets at once, you can change the odd formats and lot more, it's basically a gateway to Sports Betting bot bets without the need to navigate in the chatbot. Since you missed the difference of all those 3 things, I guess I can agree that the funnel of directing the users to right services could be better, but if you are interested to read more about the evolution of sports betting on Byteball then you can do it there https://medium.com/byteball/new-tool-makes-the-byteball-betting-bot-more-user-friendly-and-enticing-to-both-cryptocurrency-7191f14a7460
This one just feels like you are nitpicking on random things. Do you really think that if the chat response that is in black color and a link color that is blue doesn't make it clear that users can click it? Because that what links do on web and on chats, they are in different color than rest of the text and you can click on them. Also, open up any other chat app and you will see that there is a button(s) next to the text box where you can type and when you click on it, it offers you other stuff that you can insert into the message. Anybody familiar with any chatting app should feel home with Byteball app because it works like rest of the chatting apps. This is one of the core difference from other cryptocurrencies, which build different UI for different services, on Byteball, all apps work similar way, as chatbots. And some like Sports Betting bot even have web interfaces if chatbots are still too revolutionary for you.
RE: The problems with Byteball