The problem with a dutch auction is if you don't know how a dutch auction functions, it looks like you're getting royally screwed. That's why they're usually reserved for professional settings.
It's like the complete opposite of "bidding fee"/"penny" auctions, which are very scammy and provide plenty of profit to the auctioneer, but people feel like they could get a great price. But if you make the math (and notice the dark patterns and know that usually there are also fake bidders...) you can see how much of a scam they are.
Pissing off your customers by nakedly profit maximizing is great for one shot life games.
They would maximize profit for this launch and in the process damage a reputation that is literally worth billions. Gamers are famously sensitive, and famously have a long memory for PR fuckups.