Some years ago I have used cex.io service of Cloud mining (yet some years ago they have offered that service and It was also possible trade computational Power).
At a certain point the whole process become completely inefficient with high fees, and practically negative gain or ROI (at this point as suggested you can earn more Just hodl your Coin or with DeFi etc).
Most of Cloud mining sites are just Ponzi all user with experience agree on that and you can check by yourself... No sites provide real proof of mining but Just fake information.