It's hard to say someome is stealing ideas. And in fact I don't have a problem with the villages and stuff MC adds now.
Villages are atm ugly and useless, the wired looking villagers have no use at all. No way MC competes Mythruna's goals at this point. The added features in the releases seem to be rushed, buggy villages without inhabitants, griefing npcs etc.
No idea where MC is going, the variety of new features makes it difficult to identify the final goal and does not fix the big MC problem that it gets boring after some time playing it and tired out most features.
Mythruna has a final goal Paul wants to reach. MC added some things that were on the list of Mythruna but added loads of other stuff, too. So I personally don't think MC is stealing Pauls ideas but the lack of a concept makes it look like stealing. On the other hand I'm sure Mojang is buisy on the internet and will be inspired of other new games and concepts.
I'm not worried at all. Paul aims for a goal MC will never reach or is wanted to reach.