Are people still renting cloud computing Power to mine Bitcoin?
No, you can't mine Bitcoin with CPU or GPU.
As far as I know, Bitcoin can be mined using CPU and GPU but it is well known that it isn't profitable using those anymore since it cannot compete with the hashing power of ASIC.
But if you actually mean cloud mining, almost no one bother with it these days. Although marketplace which let any people buy/sell hashrate (such as NiceHash) manage to maintain their popularity.
True! , even renting hashes on NiceHash seldom brings profit.
Most cloudmining are scams since they eventually crash at some point. It is not a sustainable venture and is most likely used by criminals to scam investors through Ponzi schemes.