People pay for proposals, so it is not unreasonable that Hive notifies people that the proposal exists. I recommend creating your own proposal to find out how poor the current system is.

Would you trust a cure for cancer getting advertised in x.com with spammy tags ?

I have studied cancer and healing for over 20 years. It's a big topic. I don't suggest blindly trusting anything that anyone ever tells you about health topics - do your own research. You can't do your own research if you can't hear the people with relevant information. The free flow of information is paramount.