Microsoft's cut is pretty small (5%, or 15% if the software is discovered through the store [1]). I think there's a more important consideration though: buying Krita through the Windows Store makes it more popular on the Windows Store, which means it gets recommended (advertised) to more people. I think 5% is arguably worth it to grow the user base.

[1] https://www.zdnet.com/article/microsofts-windows-10-sweetene...

Wow I could understand that mentality about the Microsoft store, but steam? They are the most indie friendly platform.

Maybe ppl still upset that HL3 was the biggest hoax since Duke Nukem Forever? But before I let you finish, TF2 hats and the steam platform were the two best things Valve ever did for the world.