How sustainable are NaaS projects?

Now nodes as a service project are quite popular now in crypto. They reward you for buying some sort of space that allows you to earn passively but the most reliable ones thus far are Flux nodes and Dfinity's ICP. Thor nodes, Ring nodes, and the others are great, but like most projects in crypto, they need to stay for some time before anyone can talk confidently about them. If you are considering an investment in NAAS projects, it is advisable to consider the OGs in the game like Flux. The older the platform, the better it is.