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Wikipedia lets you specify the license. E.g. https://en.wikipedia.org/wiki/Linux#/media/File:Tux.svg has three permission details, including Creative Commons CC0 1.0.

A lot of companies release press kits for proper usage of their logos without necessarily transferring the IP. I imagine in a lot of cases (including Wikipedia) it falls under fair use -- ultimately the logo is still trademarked.

Release it under a CC 4.0 license. Section 2b2:

> Patent and trademark rights are not licensed under this Public License.

IIRC a lot of logos technically don’t meet the threshold of originality so they’re not even copyrightable

In particular, as well as the obvious "can't copyright a circle" concept, wordmarks often don't qualify for copyright. Even if the typeface is copyrighted (as many are), that doesn't transfer to writing in that typeface. As usual, exactly where and to what extent that is true can vary around the world.

Trademark rules still apply, so you still can't take the Google wordmark and slap it on your company even if the logo is on Wikipedia Commons.