If you have a read-heavy app (99% of saas) that runs on one server and dont have millions of users then sqlite is a great option.
Usually you want to be able to run multiple webservers against a single database though, since that's the first thing you'll usually need to scale.
If you have a read-heavy app (99% of saas) that runs on one server and dont have millions of users then sqlite is a great option.