As another user mentioned, it can potentially be highly profitable with very minimal active participation.
I recently tried this and can say that it's one of the best investment options out there in crypto. Not to say that it doesn't come with any risk, but if you do your due diligence, and have some basic knowledge of trading to be able to pick out a good trader from a lucky one to follow, this could turn out to be highly profitable for you!
In a week I've gotten >20% realized returns already.

Indeed it can be highly profitable. You can see some traders on
1brokerbtc.co make more than 100%+ returns within the month.
But like you said, takes a bit of trading knowledge and feel of the market for one to be able to pick out the right traders to follow. Much easier said than done!
I can't say it's totally hands off as I personally still monitor it every couple of days to make sure that the traders I'm following are still doing well. More often than not it takes weeks and months of trade data analysis to be able to tell if one is not only a profitable, but consistent trader.