They are not required by any means to do anything. Unless you live in South Korea(Laws). You should read the terms and conditions.
Also
alpha = Adding material to the game. LOTS of updates
beta = All base material added(objects for you programmers), polishing and adjusting skins to fit base material.
If you want to correct someone, by all means, do. Just come with something better than "Alpha no its beta, just a bad beta"