If your intention was to gain yield, you'd much rather go for altcoin staking using a responsible amount of money instead; whereas you can get 20% to upwards of 80% of yields
Different risks, sure, but I don't think it is necessarily any less risky.
If you use a third party then you are exposed to all the same risks as depositing your bitcoin to Celsius or a similar third party. If you do it from your own wallet, you are still having to sell your bitcoin for an altcoin (99% of which are scams), lock your coins/tokens up in some smart contract (
many of which have been hacked or had critical vulnerabilities or bugs), and not be able to react to price changes when your altcoin dumps. Rewards of 80%, or even 20%, are completely unsustainable and not at all covered by block fees. The most likely outcome here is that the coin in question is simply minting or releasing new coins/tokens at will to pay out these rewards and grossly inflating the supply, making it no better than fiat and leading to an inevitable price dump.
I've never understood why in a space where we have seen returns orders of magnitude higher than any other asset, people are willing to risk all that to squeeze out another few percentage points.