Wikipedia has costs associated with it and the data has value. The info is on their servers, that means someone controls it. If they were losing money and decided to sell, then the data is in the hands of the new owner.
It is still a centralized database, same as Twitter and Facebook.
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This is true for the Hive blockchain too. The witnesses are often running their nodes at a financial loss.
The founder of the Wikipedia is Jimmy Wales, and he told Elon Musk that the Wikipedia is not for sale. Wikipedia is run by the Wikimedia Foundation, a nonprofit organization.
This is not the same as Twitter, nor as Facebook. Those are owned by profit oriented companies.