From what i've read ECR is very much part of the equation for rewards... playing 24/7 will make that number much lower and thus they'll earn very little if anything.

That's why this section was highlighted... it's important for anyone (including bots) to be in the league where they can acheive a reasonable win rate.

It is still an issue if bots gets matched up with their own bots AND know they're playing their own other bot and that is an unfair ability to bots. But assuming they fix that then i don't see much advantage to bots playing 24/7 ... however there is an advantage in the fact they can be more consistent with their usage of their ECR and time it better playing every X minutes. Humans tend to play in batches so a bot will manage their 30 plays a day better.

I think a better question is do bots or humans have a higher win rate? (assuming again you take away their ability to know they're playing themselves)