Not super familiar with Fauna as a company... not sure "random" applies, but I generally think the same way. If a provider can offer something that adds real value over alternatives, though, it's not a bad decision to go external.

However, never rely on an external provider if there's not a low-risk offramp plan. Can I export all of my data and easily migrate, worst case scenario? Are there open source options using the same or similar formats/workflows/etc? Is the format itself proprietary or lock me in otherwise? Those sorts of questions need to be figured out fully before jumping aboard.

If you work in IT, you most likely rely on 'random' external companies and random external OSS contributors to be honest.