Are you implying that maybe the dev is implying their game didn't do well because it lacked a good enough opening hook? Well, that could be possible, and maybe models like Game Pass force games to be more honest to a point where it could help or hurt them...but so do demos. And with demos, if they do hook you in, you still have an incentive to buy the full game as the demo is only a portion of said game.
With Game Pass, the whole game is in the service so unless the dev struck a really fat paycheck or a payment deal based on metrics that especially favor the type of game they've made, there's a very good chance they will leave money on the table because B2P sales will drop. And rightfully so, because honestly once you have the full game for "free" in the service, only the hardcore have a reason to still buy it (and usually for collector's editions).
It bears out in other media too: most people subbed to Netflix don't bother buying those shows and films on Blu-Ray, only cinephiles and hardcore home theater buffs really do so and they're a very small portion of the total userbase.