For example, here, at the bottom of the page is an ad from ethicalads.io
It is everywhere under https://dev.qubes-os.org/ as far as I can tell though
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I wasn’t aware of that!
There is a “Gold membership” (50$/month) but I suppose that is already the case on the official link (https://doc.qubes-os.org) where I don’t see any ads?
https://dev.qubes-os.org is currently broken:
But still, the issue is concerning links under https://dev.qubes-os.org/projects/ like:
https://dev.qubes-os.org/projects/core-admin-client/en/latest/
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I think @marmarek was able to get rid of the ads on doc.qubes-os.org by subscribing to some kind of ~$5/month tier available to FOSS projects, but I guess that didn’t apply to dev.qubes-os.org. 
Interesting…
Only thing that seems limiting is amount of custom domains, but this one seems to be 0 for basic level, which means we have a proxy for qubes-os.org in front of readthedocs. Feels like this configuration should cover all subdomains.
Besides, all tiers allow subprojects - hosting two documentations from single account is possible.