I joined one of these Slack groups out of curiosity. They had 700 members, and as far as I could tell not a single one of the people active in the discussions was involved with a VC.
A lot of hustle, but it felt like activity was dominated by people with more free time than actual VC work.
Unfortunately, I worry that eager VC firms are going to use this to their advantage. Plenty of young people hoping to get rich quick in the VC world will do a lot of free work in the hopes of securing a job later.