Bitcoin was never meant to be truly anonymous.
Wikipedia is the worst website on the Internet you could donate to.
Wikipedia is a "non-profit" website that puts real businesses out of business. They have effectively cornered the online information market and instead of using advertising-based models (which create revenue from the non-enthusiast users), they ask the enthusiast users (who already contribute countless hours of work maintaining pages) for donations.
A few years ago I ran a very large online forum. All revenue was ad revenue. I disabled all ads for all registered users, because they're already contributing content to the site - you don't need to take their money, too. Instead, I let people who were not contributing by posting (unregistered users) contribute financially by littering the site with advertisements for them.
I strongly feel that this is the correct way to run a business (or even a nonprofit website), rather than ask your very best members to contribute money. Wikipedia should partner with Google's advertising and serve advertisements to all non-contributors. Google already puts them #1 for every search term (which pushes the informational sites on specific topics from
real enthusiasts out of business), so it would only be natural.
If you want to donate to a site in that space, I'd recommend
archive.org. The primary monetary contributors are going to be the users who utilize the resources they provide the most extensively, so asking for donations seems reasonable in their case.
Tails is okay and probably more worthy than archive.org. However, there are lower-funded privacy and anonymity projects you can contribute to that don't constantly have security holes. Properly configured TBB plus FDE is likely significantly safer than Tails.