Going server-less through CloudFlare Workers have been a game changer for a small SaaS company like ours. It has proven to be the ultimate choice for new backends supporting features we're still testing market fit against.
Our Cloudflare workers are a vital part of our architecture and we are heavily investing in it for new micro systems within Parrot Software.
Cheap, reliable, infinite scalable and even better paired with a database such a CouchDB (the one we heavily use) since it is HTTP first.