Everyone agrees C has problems, but there’s no consensus on what those problems are. People build ‘better Cs’ to solve the problems they see in the language, and offer them to the community for the benefit of those who share their tastes.

It’s perfectly fine for you to disagree with them, but it’s also perfectly fine for them to publish their solutions to their problems.

‘A better C’ is a good description for these projects. ‘The better C’ would not be.