The 2017 expansion draft decreed that existing teams could protect only 11 players on the roster, and not including players with fewer than three professional seasons. Previous expansion drafts allowed teams to protect up to 15 players (Thrashers, Predators, Ducks, Panthers), 16 players (Senators, Lightning). I forget what the Sharks were allowed, but I think it may've been even more.
Also, on top of that, Vegas was able to trade with teams for non-interference, in other words: "We won't draft your unprotected player, if you give us X". That was never allowed previously.
I understand the intent is to make the team more competitive than in years' past. The goal is to make the team more popular with the nascent fanbase without the fear of losing 60 games. But when you're taking the top 7-8 forwards or the top 3-4 defensemen off of teams who can't afford to keep & protect more than 11 guys, that's already a competitive. Add a good coach and hot goalie and you can go crazy in the playoffs.
We'll do the same stupid thing with the Seattle Krak-heads next year,