There is Apple enterprise for this reason. Depending on the set of APIs you want to use (which should be limited since you spoke of webapps), it allows you to distribute internal business apps.
Don’t know how known this is. But we use it mainly for internal testing.
> The Apple Developer Enterprise Program allows large organizations to develop and deploy proprietary, internal-use apps to their employees
> Your organization must:
> Have 100 or more employees
Again, it's clear that they're providing this out so that organizations with power don't have to start a fight, while small organizations can't do anything.
Even aside from that, it's clearly going to be so much work that we wouldn't be able to do it. I'm the only developer at the company, I cannot get bogged down in Apple review processes.
Don’t know how known this is. But we use it mainly for internal testing.