My thoughts is that these signature campaign is obsolete in todays social media world. They can spam telegram, Facebook, email accounts, twitter etc to promote their ICO/airdrop/Bounties.

This forums would be better off with focused discussion on real issues, ideas, Anns etc. People can still earn their bounties in the other arenas. Bitcointalk has been diluted to a point of ridicule. I wholeheartedly agree with OP, but unfortunately I do not have any merit to prove this.