So you evidently see a demand for Gitlab support (you can barely reject the requests at the same rate they come), at the same time you claim that there is simply no market for it?
We don’t support Linux because the low marketshare on sales.
And that why a lot of people suffer from bad software - it was the first known and they don’t think in long term.
PS: GitHub is usually not an option for closed-source software. Not because of the uncertain development of the fees. Microsoft’s security track - especially for the cloud - is bad. And if you lock yourself to cloud services you end up in vendor lock-in. And that’s also open-source projects tend to Gitlab and others. As usual, GitHub was the first big player.
This is like freemium^2. People aren't buying gitlab licenses because a) too expensive [1] and b) not needed for the functionality in the free product.
[1] "too expensive" is in the eye of the beholder and requires visibility of ROI, COGS, and development velocity.
They don't want to invest in integrating their product in Gitlab, because it's 1/4 the size of Github and they see trends pointing to a Github resurgence.
If you have limited resources to build integrations then sure, I guess?