This is somewhat of an aside, but 2 Mb is absurdly large to allow for a profile picture. It seems that the largest this picture is ever displayed at is 240 x 240 pixels on your profile page. Even completely uncompressed and 3 bytes/pixel, that only comes out to 0.17 Mb. There may be some point in allowing people to upload up to 512 x 512 pictures, but beyond that makes no sense.

It would be better to clearly spell out the requirements (pixel dimensions, aspect ratio) and have people upload an exact fit. That gets around unexpected artifacts due to inconvenient resizing, what to do with uncovered background, etc.

LOL! My profile photo is compressed. My original (very high quality) is 4 MB, tried to upload it but failed, so I used mine now which is 2 MB or 1 MB.

I have 512x512 px JPG avatars (90% quality, still quite high), and they take each 150KB at the very most. In constrast, the PNG versions take 600KB. But it's simply because PNGs are lossless, so... So yeah, it's a weirdly high bar.