Not my problem...and I've been on the receiving end of the short side of the stick on a couple occasions when I had to move back for the "rightful owner" of the seat. I'd rather be aggressive about securing my seat immediately when the mobile app shows me upgraded and risk going back vs sitting there quietly and missing out on an upgraded I should have cleared into.

The one time, many years ago PMCO, when I did remain quiet and failed to speak out aggressively, I ended up screwing myself and 3 other people on the list when a GA came on board and moved a father and his mentally challenged son up and ignored the remaining passengers on the list - and F went out with one empty seat to boot.

I won't be doing that again - every time I smell shenanigans or laziness, I will be punching the call button or offering a loud "excuse me" in order to clear up any "misunderstanding".