99% of all cloud mining sites are Ponzi schemes.
If you invested in one and you somehow have a chance to make a profit you should DEFINITELY get out while you can.
And be sure to thank god that you are one of the lucky few who got out before the scheme fell apart.
Defintely yes, mining sites are long term ponzi scamming sites. They will give you first a little ROI but later on they will steal the remaining 25% of your investment. The only mining site that is paying and that has payed me well is cryptomining.farm but I dont know how long will it be paying.
The big question on the mining sites is, if mining is profitable then why are they selling hashpower, they alone should be enough if mining is profitable. So before investing on mining sites it is better to rent a mining rig and mine a new coin.