@TURION-MOONSTAR It's never wise to assume. At any rate, simple observation of the botched PC launch, would have shown you how many non console players had a vested interest in PSO2, given how crowded the servers were.
The fall off was due to that botched launch, as even though many were able to play, many of those people were using a third party tweaker, just to install the downloader for the launcher.
Many more couldn't get it to work regardless of what they did. And even those that managed to get the game to work, either through Microsoft's store, or the Tweaker, both had the game randomly delete itself, or become unplayable, and un-installable.
This is a Microsoft issue, as their PC end store has been known to be problematic.
Even the launch of their own Sea Of Thieves on PC had it's share of issues.
Microsoft needs to fix things on their end, and it starts with fixing their PC app.