The problem I think is that all the easy infrastructure problems have been solved and the market is crowded with those solutions. Solving the hard problems is probably where you could have a viable business but I don't really see that many companies trying to solve those:

* Making mono-repos work for large companies.

* Mixed language builds are still a ci/cd unsolved problems for most companies.

* Testing strategies for Iac deployments.

And more that I won't bother to list here.

This would make a great blog post: high hanging fruit of digital infrastructure