Not sure about the third one, but those first two issues were resolved by massive revisions to the sub's rules (voted upon by the community) in December. Now instead of mods determining what they think the quality of the content is, they have a bot that allows users to vote on it instead.
r/Minecraft is not going anywhere. This only concerns Mojang's official posts.
o/ Great to see this community getting the care it deserves!
The title is misleading. r/Minecraft is staying on Reddit, this only concerns official Mojang posts such as news and changelogs.