The NHL gave every advantage they could to the Vegas franchise for expansion hoping to make them instantly successful. Maybe not cup Champs successful, but they've hugely benefitted from the incredibly liberal rules around expansion this time around.
I have no doubt this was done intentionally to make expansion look very favourable to other cities given the massive expansion fees any new tam pays, plus they wanted to make sure their new franchise doesn't struggle like every other one in the past that just ends being a drain on the league with constant money problems in 5 years.
They also lucked into one of the best head coaches in the game in Gallant after Florida went full retard