Rank Farm Servers
Rank farm servers isolate these people from the rest of the player base. The progression in custom games isn’t even that much compared to actively playing Solo Queue or Team Queue unless you’re really bad or really laggy.
On the other hand, if you really want to slow their progression, take the current 300 bonus points for winning and cap it at something like 5 times a day. Yes it’d hurt the “hardcore hotjoiners” but that term really shouldn’t even exist.
It’s almost impossible to nerf them without taking a sacrifice. Are you willing to accept either crappier games (with the farmers in normal games) or reduced/capped rewards?
PS: your last suggestion (disabling reward tracks) would create a wall bigger than the legendary/precursor grind for most players not already into PvP. That’s exactly the opposite of what they were made for (getting more people into PvP). They’re not fast to complete in hotjoin/custom servers at all, and people doing them in arenas is good, not bad.
to be faceroll at the high levels, because it
needs to be accessible to the casuals and bads.