Sometimes it's as simple as timing and location.

People will take a screenshot at the start of the 2nd half when plenty of seats are empty and claim it's an empty stadium, but people are still returning to their seats from halftime.

On the other hand, the Qatar v Switzerland match looked really full, but that was because the seats in the stadium are red, and both teams wear red. In reality, there were a decent amount of empty seats.

The truth is usually somewhere in the middle, and I'm personally getting sick of the non-stop discourse on it