Local AI servers are different because they don't have to form a single system. If one AI server goes down, just use the other one.

This is unlike customer facing systems where, if your database server goes down, you probably can't just use the other one--the whole system is down.

That makes very little sense. SaaS/cloud tooling is overwhelmingly popular for internal tooling.

Which category of developer tool has on-premise as the more popular option?

Cloud isn’t about “reliability,” it’s about being able to focus on your core business rather than spending all your time maintaining stuff.