Me neither, i even provided a source, and it's easy to find other examples. There certainly are projects that allow anonymous contributions, but i doubt it's the majority of projects that one would consider important.

For these kinds of projects you could make up an identity relatively easily and nobody would know, but you're screwing over the project (as they may need to remove your contributions if they find out), so it's not something to be doing if you actually want to contribute (instead of inserting backdoors).

The original idea (not being able to contribute without a verified identity) is still wrong, but it's wrong because it's impractical to prove identity in a way that people find acceptable (and works), not because people will not give up anonymity, as many of the replies state.