I believe whenever the “no automation/scraping/bots” clause in Ts&Cs has been test in court they have never held up. However that’s not to say a service can’t just cancel your account if you are found to be using one.

Running a site thats had a bot get stuck in a loop and suddenly x10000 times the request rate, when they go wrong it’s super annoying for the website owner. We ultimately just banned the whole AWS ip ranges.