TLDR: Mojang is is breaking the law by changing EULA terms without informing anyone while claiming stuff that is written down on their end breaks the EULA without proof of the text that makes it banned, that making it a one sided contract. They also are allowing stuff on the market place which the EULA already bans.
I believe there’s also the fact that they flat out ban the selling of mods, but “add-ons” that do the exact same thing can be sold through their store.