I have started seeing this appearing since a recent gaming services update.
Others are reporting the same thing https://forums.flightsimulator.com/t/just-started-getting-a-splash-screen-on-launch/517228/
A few months ago there was a brief period of time when the splash screen appeared but then it went away again. Fingers crossed this time!
If this is now permantly resolved it may be time to tick off this thread as “accomplished”!
I will leave it open for a few more days, to allow for an opportunity to see if this remains a stable “permanent” thing. 