Becoming educated and doing real work is better than any of those. Work -> buy BTC -> make far more than any other method.
This is always been true. But still if signature is used properly it is very good. I am on here a lot would be with or without signature.
Since it's a bonus of me being there... it's pretty nice. But if your posting just to post then yes signature is not a good thing for you.
The issue is most of these guys aren't looking for passive income. They're hoping to get rich. Signatures will never amount to anything for them compared to RL.