I wouldn't bother with it to be honest, most will probably not pay out, infect your computer with viruses, run a javascript miner in the browser or only pay out if you upgrade your free to paying plan

There are legit cloud mining sites and there is a working strategy to create a passive income with it but it requires a minimum investment of at least $1000 dollar to get started, any amount lower will not give you the daily returns to reinvest in order to keep up with the increasing difficulty

strategy explained here:

https://medium.com/@yeong.crypto/cloud-mining-a-scam-or-not-eadccaa301bc
or
https://steemit.com/cryptocurrency/@bitchminer/cloud-mining-a-scam-or-not