The cloud service is probably the biggest one. But it's not just that. JAMstack is getting more and more popular, so you'll need to support "serverless" as well

The cloud service is probably the biggest one. But it's not just that. JAMstack is getting more and more popular, so you'll need to support "serverless" as well as a way to query via HTTP. Which means you'll need some kind of "Data Gateway" proxy on top of robust authentication and authorization. There are more and more "scènes à faire" to be competitive in the DBaaS market and I don't think dbaas startup founders are aware of it.