Wikipedia is an interesting item.

The free editing is a lesser problem compared to plagiarism (folks copying and pasting whole passages into wiki entries from other sites).

Because of this, there is a high rate of accuracy on Wikipedia as a whole: https://library.canisius.edu/wikipedia/accuracy but it should be used as a tertiary source rather than a primary or secondary one due to the plagiarism, etc. Wikipedia acknowledges a preference that it be used as a tertiary source rather than a primary or secondary one, too, for formal research purposes: https://en.m.wikipedia.org/wiki/Wikipedia:Academic_use. I think it’s awesome that the site editors take the time to discuss that. :)