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.