Let's be honest for a second. If you are a bounty hunter in 1 campaign and that campaign has Facebook, Twitter, Discord, Instagram, and telegram in it, you will spend a total of 5 minutes on that campaign in a week. It's not very time consuming to retweet or share a post on all these platforms, and if original content and hashtags needs to be added the users post some bullshit as their original comment and copy/paste the hashtags. This is why bounty hunters can join 1000 bounties a week per account. It's simple work.
Probably most of them already automated the procedure. They just checked their account get the link and post it. When you check those scammers accounts you'll noticed one common thing. More than 30 activity and there isn't any merit. Why? Isn't it obvious they don't care the forum. At least with their multi accounts

Most of the project (those who want to get easy money or the project dev which absence of vision) probably wont care this situation because advertise is advertise. But if I were a project manager i would care it. And if there is a campaign manager who be careful about this situation I prefer him/her.