I should mention I've played the game for years and never have changed my password. I either remain logged in, or use autofill to quickly log back in when prompted.
Yesterday when world's reset, as expected my airlines were no longer there. However when I clicked on My Airlines another carrier showed up for R2
One that I did not start, or accept control of. My username and photo showed me as logged in.
I clicked through a few prompts to if I'd be able to make changes and was able to.
In theory I could have closed their routes, sold their planes, etc, etc.
I thought I had been hacked...........but why. Who would want to take over my random AE account.
Only to start a very simple airline. I logged myself out. I logged back in with my regular password and it was gone I was back to no airlines as I expected.
Today was normal as well.
I don't know if anyone else has ever experienced that.