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Why do you need CouchBase? The hosting comes will mysql databases?
InfinityFree is a website hosting provider, aimed primarily at websites. Most websites use PHP and a MySQL database, so that's what we offer. While there definitely are cases where CouchBase is useful, very few websites need it. And we don't specialize in running complex web applications for software developers (like, say, Heroku or Cloudways), so adding a huge variety in data stores is not our priority.
Add to that the fact that adding a new data store is an extremely complex operation due to the scale of our platform. So I don't think we'll be adding any new data stores in the future. And if we do, I expect more popular data stores like PostreSQL, Redis and MongoDB to come earlier (but probably not within the next decade either).