https://www.reddit.com/r/BotDefense/comments/14riw76/botdefense_is_wrapping_up_operations/

Like many anti-abuse projects on Reddit, we’ve done all of this for free while putting up with Reddit’s penchant for springing detrimental changes on developers and moderators (e.g., adding API limits without advance notice and blocking Pushshift) and figuring out workarounds for numerous scalability issues that Reddit never seems to fix. Without Pushshift, the number of malicious bots we were able to ban dropped to 5,517 in May.

The “blocking Pushift” part is what actively makes their work harder by a lot.