That’s silly. Counting channels a user is in gives no indication of whether it is a malicious bot, but your argument seems to be that any solution will be imperfect so don’t even try, which is absurd.
There are hard rate limits on JOIN/PART messages that limit the effectiveness of that with a single account. (Of course, there are bots that create new accounts on demand, which also defeats lists.)
Maybe people think it means “secure from the prying eyes of bots” (which it doesn’t), but hopefully no one thinks it would provide any real security, even if it worked 100%.
Let’s be honest: this is more about clearing names from the user list than any perceived security benefits. Only Twitch has the data to make tools capable of remotely effectively combating truly malicious bots (and even then, they’d probably only be effective in the remotest sense). All we can do is like putting Band-Aids on a severed artery.
Where is the business argument for better tools to improve Twitch chat and user safety? Amazon is not in the business of doing work for nothing, and it should be pretty clear Twitch is under the same pressure.