Type of project?
How long has the project been on the market?
How many people are working on the project?
How much mining dividend has the project paid so far?
Etc.
Pay attention to all these things. Thank you for your question.
You can find those things in investor based game section if you look for that type of investment option in this forum and this is not recommended already for such a long time since all of cloudmining platform are all scams. So there:s no really needed to do deep research about them and ask all those question since there's no legitimate on them and better mark it is so that we will not fall on cloud mining scams.
Other options are more better than investing on cloud mining since we might get good returns on choosing other option like trading or investing on selected NFT's.