We sometimes accept “not totally free” software. Minecraft is neither free nor open source, so that’s a firm “no” for it to be in the catalog. This should not prevent you from installing it with the address of the repo.
I know Minecraft Java Edition is already existed on YunoHost GitHub Repro. But, will it be also great if they add Minecraft Bedrock Edition to YunoHost GitHub Repro?
Just to add a little info about Minetest, there are a few plugins existing in Minetest, and a few of them are to make it as close as possible of Minecraft.
In YunoHost, for now, 2 plugins are available from the web-install directly, one of them is Mineclonia.
So, OK, this is not Minecraft, and there are a lot of differences, but it is quite close, free, and open source.
I know this may not be what you want (if you want Minecraft, this is NOT Minecraft), but from my point of view, it is a really nice alternative.
Minecraft server IS free. It is the client that is paid. Seems kind of silly to not allow a completely free app just because there are paid apps that connect to it. Also, a quick google shows that Yuno is shooting itself in the foot with this since most alternatives support it. Also, kind of kills the whole “We’re not going to do it on principle!” and then link to the “Oh, but here is how you can easily by pass it and run it anyways”. Just saying, I’ve been on Cloudron for a while and was looking for an alternative. Both the fact that you don’t have an out of the box Minecraft option PLUS more importantly, the pointless attitude of intentionally refusing it is a huge turn off to someone shopping around.