> but you now need to re-invent all of the AWS APIs you use or might use and it's big CAPEX time investment

Or maybe you just never needed most of these in the first place. People got into this "AWS" mentality like it is the only way to do things. Everything had to be in a queue, event driven etc.

I'd argue not using AWS means simplifying things and it'll be less expensive not just in server cost but developer time.