In reactions they conveniently left out "false positives we still hadn't weeded out". On top of that it can be annoying to have bots making trivial PRs in their own format when you've got a well defined process for it. Lastly it was basically spamming an ad link for the service at the end of the PR comment - even if the other issues didn't come up it's not always well received to do that.

Looking at 1 bot it doesn't sound bad, when you have everyones bot doing this kind of stuff it can quickly become more of a nuisance than a help.