URT was amazing game.
Especially jump mode and maps.
Its non-comparable and unique.
If it stops running on Linux natively, it is DONE for me. Off the table.
Anti-cheat is NOT the reason for possible all-close source.
They know binary-based anticheat does not work, only human-based works.
Hence there is (was) UAA(urtadmins dot com).
The new part in 4.2 was going to be "passport" access, which would identify and narrow each player as unique and make his ban most efficient and least touching other players(unlike ip/subnet, nickname or GUID bans).
If Urt goes closed source without pure native linux support, it becomes payed one-of-many trash.
Like Blizzard. Do you hear, Blizzard? Your battlenet and co run soley on linux, yet no single client software for linux. You are crap, Blizzard.
If Frozen Sand were smart, they would help host challenges and make money by this, if ads is not enough. The only thing which they do with payed finance model is HUGE popularity drop.
There is nothing "unique" on their 4.1, openarena looks visually definitely much better.
The unique part is(was) gameplay(jump mode) concept.