An internal user that can wander over to Bob and say hey, this thing isn’t working quite right, I’ll grab a coffee with you and we can talk through it, is very different from a paying corporate who will not tolerate service falling below a certain standard. I joined a company where they were trying to transition an internal piece of condition monitoring software to be a SaaS app and it went really badly wrong, the sales people seemed to assume it was ready for this but it just wasn’t and needed a huge amount of hardening and security work, not to mention features to make it easier to use.
There was no market for it, it was too expensive, too unwieldy and too nonstandard.
AWS could do 90% of what the custom cloud product could and the last 10% was regulatory stuff, not technical.