So I would disagree both that Wikipedia has nothing to do with free speech, and that it’s not about anybody’s opinions or ideas.
Free speech allows Wikipedia to publish unpopular or controversial speech, but that's not the same as having an editorial policy that contributors are allowed to express themselves on the platform, which would obviously be inappropriate.
Wikipedia documents opinions and ideologies but that's not the same as supporting the expression of the opinions and ideologies of its contributors. (See above.)
As an individual, sure. But it's still a massively "go to" source of facts for billions of people.
> Free speech allows Wikipedia to publish unpopular or controversial speech
Do you really feel like Wikipedia has unpopular opinions? My impression is kinda opposite.
> Wikipedia documents opinions and ideologies
It would have been awesome if it was actually plural.
OP was conflating the two, but Wikipedia has no obligation or principle to be a platform for free speech. It's completely irrelevant.