From where I sit, right now, this does not seem to be the case.
This is as if writing down the code is not the biggest problem, or the biggest time sink, of building software.
Often these SaaS tools are expensive, aren't actually that complicated (or if they are complicated, the bit they need isn't) and have limitations.
For example, a company I know recently got told their v1 API they relied on on some back office SaaS tool was being deprecated. V2 of the API didn't have the same features.
Result = dev spends a week or two rebuilding that tool. It's shipped and in production now. It would have taken similar amount of time to work around the API deprecation.
For anything that is billed by the human, O365 is the benchmark. I’m not paying some stupid company $30/mo for some basic process, I use our scale to justify hiring a couple of contractors to build 80% of what they do for $400-600k in a few months. Half the time I can have them build on powerapps and have zero new opex.
If they were a little more chill then I'd think they could make much more money. I personally would pay a few services, even as an individual, right now, if I knew I could always get a good database / JSON dump of everything at a 5-minute notice, and build my own thing on top of it.
They don't get this psychological aspect at all.