From the article:
A volunteer-made project that fights bots on Reddit is shutting down. BotDefense, a tool that helps fight bots in more than 3,600 subreddits and has nearly 150,000 accounts on its bans list, will be going away.
As for why: The community of users and moderators submitting accounts to us depend on Pushshift, the API, and third-party apps. And we would be deluding ourselves if we believed any assurances from Reddit given the track record of broken promises. Investing further resources into Reddit as a platform presents significant risks, and it’s safer to allocate one’s time, energy, and passions elsewhere.
Yeah, I’d imagine it’s possible to identify the behaviour that some bots followed on Reddit. It also does help that global karma isn’t a thing since it was a big part of the incentive that led to bots in the first place. I don’t know if you ever encountered the subreddit “FreeKarma4u” but it was basically just a sub with no rules that allowed bots to upvote each other’s posts and comments until they met the karma threshold to start posting on other subs.