This is incredibly stupid. This is just going to make games even more unprofitable to make for their developers, and push it towards live-service/F2P games over traditional ones, since account selling is prohibited. Its hard enough to survive in that sphere making traditional games now; enabling the Gamestop effect on digital games is probably going to hurt beyond compare.
I think it will cut down on those massive Steam sales, which basically work by encouraging people to buy a bunch of games they don't actually want and won't play.
I think that might cut down on the diversity of titles, but also could drive up quality.
It might fix the problem of loot boxes. If the law applies to games, then it may apply to in-game items as well. Then players would be able to buy in-game items on secondary markets at known prices rather having to gamble for them as they do now.