This is actually very explicitly against the rules:

> The reply and mention functions are intended to make communication between Twitter users easier. Automating these actions to reach many users on an unsolicited basis is an abuse of the feature, and is not permitted. For example, sending automated replies to Tweets based on keyword searches alone is not permitted.

https://help.twitter.com/en/rules-and-policies/twitter-autom...

I'm glad it got banned too - bot replies are the worst.

And since it's nit-picking, it's worth noting that the "could/couldn't care less" thing isn't at all as clear-cut as you are making out.

In the early 1990s, the well-known Harvard professor and language writer Stephen Pinker argued that the way most people say “could care less”—the way they emphasize the words—implies they are being ironic or sarcastic along the lines of the Yiddish phrases like “I should be so lucky!” which typically means the speaker doesn’t really expect to be so lucky. Michael Quinion of the wonderful World Wide Words website makes the same argument.

and

Both Merriam-Webster and dictionary.com have weighed in and say “could care less” and “couldn’t care less” mean the same thing. Their reasoning is that both phrases are informal, English is often illogical, and people use the two phrases in the same way. “Could care less” has come to mean the same thing as “couldn’t care less.”

https://www.quickanddirtytips.com/education/grammar/could-ca...

Replies are considered a spammy way of getting attention.

This wasn't Twitter arbitrarily banning you, but people repeatedly reporting your tweets. The option is right there, and aptly called "Uses the reply function to spam".

It probably did that even if you wrote a comment saying something like:

"I could not care less" is a malapropism we should strive to avoid.

A reason why it is bad: I tweet only little and when I do I'm interested in the 2 or 3 replies I get. Those I can handle with notifications being turned on. A seemingly funny bot then innocently interrupts me. If that would happen to me I'd report it for having my peace.