it's really easy to spot a bot comment since they always point you in a specific direction.
to they send a link? Bot. do they tell you to message themselves or a specific user off-platform? bot.
Now, of course, there's a case-by-case basis for these things, but tapas has such small communities it's easy to pick out who's a regular commenter and who's a bot.
If you're ever on the fence, click on the users' account. I'm pretty sure you can check their comment history on there (or what series they're subscribed to).
One last thing: usually, bot comments give off a "too good to be true" vibe. What is the comment promising/advertising? for example, this comment was advertising someone who can promote my (EXTREMELY SMALL) comic for free! And only 2 days after I posted for the first time? It's almost too good to be true! And that's because it is lol.
And like I said, when they tell you to go off platform (i.e. "this person on discord), it's also most likely a bot.
Hope this helps!