Ungoogled Chromium is still free software even if every second website rejects it. Free software does not have a de facto right to interoperate, and does not be

Ungoogled Chromium is still free software even if every second website rejects it. Free software does not have a de facto right to interoperate, and does not become less free or structurally impossible because other entities don't interact with it. The freedoms define what you can do to and with software you possess; it does not put requirements on 3rd parties to interact with you. In the same way that commercial entities aren't guaranteed a business model just because they want one, free software isn't guaranteed connectivity to other people's systems just because otherwise it's less useful.