I am also having this issue. Oddly, the game ran fine last night and early this morning - the "game stops on splash screen" thing just started around 10-11am today. I talked to Ubi support and opened a ticket, but it seems like we're in the minority here.

This really sucks. I got the game all set up, benchmarked and tuned for my play session, went to start around 11 this morning and ended up with this. I reinstalled everything to the C:\ drive with no avail. I subscribed to Ubisoft+ based on this game and I'm really let down at this point.

@dalver I had the exact same issue. Last night the game launched fine, I did some benchmarks and tuned my settings. When I went to play around 11am this morning the game just took a dive and I've been on the splash screen train ever since. I'm wondering if they did a hotfix or a small patch that's causing the issue? I had no issues last night.

@narot23 EDIT AND NOTE: I was able to resolve the issue by reverting to NVIDIA Driver 457.09... I'm not sure why but the "Game Ready" driver was causing the issue on my PC.