For allowing such things as "passive yield" you probably have to
1. convert your bitcoins into something else - probably altcoins althoough they sometimes are pegged to bitcoin and may look like they're bitcoin
2. possibly send out your money into others' custody

This means that you are on the risks of the other coins and platforms from price fluctuations against bitcoin in some cases to vulnerabilites of those coins/chains/platforms.
Even more, as you know, not your keys, not your coins.

I will also add that if something looks too good to be true, you better stay away.


So, as others said, I would not risk by bitcoins for some virtual pennies to earn. But what I'm telling is only common sense general stuff, I didn't risk my money to see about those platforms.