With many games the copyright comes to an end and, when that happens, one company no longer has the entire market for that game. Consequently anyone else can make the game, to undercut the original price competitively. This happened about a decade ago with 'Connect 4', originally a premium product by MB games, nowadays anyone can make it but they have to call it 'Four in a Row' or something like that. Needless to say the clones and the updated 'Connect 4' are rubbish compared to the 1980's vintage version.

I don't know what the copyright situation is with Scrabble, however, there's bound to be some reasons like what has gone on with 'Connect 4' meaning the product is degraded.