I'm not the OP, but I do have an annectote.

We've got an backend pipeline that does image processing. At every step of the pipeline, it would make copies of small (less than 10MB) files from an S3 storage source, do a task, then copy the results back up to the storage source.

Originally, it was using AWS but years ago it was decided that AWS was not cost effective so we turned to another partner OVH and Backblaze.

Unfortunately, the reliability and throughput of both of them isn't as consistent as AWS and this has been a constant headache.

We were going to go back to AWS or find a new partner, but I nominated we use NFS. So we build nothing, pay nothing, get POSIX semantics back, and speed has gone up 3x. At peak, we only copy 40GB of files per day, so it was never really necessary to use S3 except that our servers were distributed and that was the only way anyone previously could think to give each server the same storage source.

While this isn't exactly what the OP and you are talking about, I think it illustrates a fact: SaaS software was seen as the hammer to all nails, giving you solutions and externalizing problems and accountability.

Now that either the industry has matured, building in-house is easier, or cost centers need to be reduced, SaaS is going be re-evaluated under the context of 'do we really need it'?

I think the answer to many people is going to be no, you don't need enterprise level solutions at all levels of your company, especially if you're not anywhere near the Fortune 1000.

I ran a shared services org in a Fortune 50. Enterprise costs don’t scale down well, and things that are absolutely essential to supporting 100k people sound insane for 100 people. Our senior leaders would sometimes demand we try and the CFO and I would just eyeroll.

Nobody would hire the JP Morgan IT team to run a dentist practice IT workload. Likewise, AWS can save you money at scale, but if your business can run on 3 2U servers, it should.

You can use NFS on AWS, they have a hosted version (EFS) that is actually pretty neat.