eToro offers copy-trading functionality for crypto markets, though I haven't tried it: https://www.etoro.com/en-us/copytrader/
They apparently don't charge anything either, which is hard to believe. I don't understand how they incentivize the trade owners.
According to eToro's site, there's some sort of system that they call 'Popular Investor' (click for direct link on eToro's site to this) where it's possible to get paid a fixed amount per copy from other people once you meet the various requirements that are also listed on the page I just linked. Seems potentially pretty lucrative considering you can get one-time payments on top of a per-copy payment for reaching various levels determined by your total equity, time in a previous level and how many people are copying you, though I have no idea how the rates are per copy.