Rollercoin: Mostly a ponzi where they debase their own currency, but... with a lot of time there is possible to get sats, and the main advantage for my point of view is that you only need an email, no KYC.
If you have something else to spend your time... use that, read something about btc, try to learn something to build a service and earn sats, etc, if you read SN you are in a good path.