I don't know if they do or don't, but they should. For-profit companies shouldn't have volunteers...they should have paid employees, or contracted employees.
Meta can pay their moderators. Google pays for YouTube moderators. TikTok pays for moderators. Discord pays for moderators. Twitter (sorta) pays for moderators. Why can't Reddit?
Hell, YouTube shares ad revenue with the content creators. Not a fan of Google in general, but even they have some common sense when it comes to sharing the revenues with the people who generate them.