Yeah so there's so-called Stitch Maynia which is the one you're thinking of. But then I think people realised how unsustainable that was and now there are about a million offshoots and competing May challenges.
Medieval May was a new one I saw around the place this year, and a friend of mine is trying to get something called Moody May off the ground too. Of course a lot of people take an existing challenge and just make up their own rules, which is how we get vaguely-defined variants like Stitch Sania.
Then there's the fact that the 100 Day Project runs through May as well...basically there's a lot going on at once!
I learned early on that such challenges are not for me and I have enough stress in my life as it is without making cross stitch into another source of it ๐