@budududuroiu @Geri That's a good method! However, the people in the picture on the left are largely confined to a road, which stretches out of frame on both sides; you'd also want to take into account how much of the road is occupied when making your estimate. Is there any way to get an idea of that?

But yeah: the Together Alliance want their (reported) crowd sizes to be bigger than the (reported) crowd sizes in the far-right rallies, so there's motive. (The Met also has motive.)

@budududuroiu @Geri That's not necessarily true (see https://en.wikipedia.org/wiki/Argument_to_moderation). You'd want to take into account the track records of the various parties involved (e.g. for systematic error, and partisan reporting bias), look into the methodology used to produce the estimates, and perhaps try your hand at producing your own estimate.

As Wikipedia says: if one party claims the sky is blue, and another party claims it's yellow, that doesn't mean the sky is "probably a shade of green".