A 1080p display is 1920x1080 pixels; at 32-bit colour it takes almost 8 megabytes to store that. Many contemporary displays have better resolution than that, and cameras on even fairly outdated phones can take pictures at much higher resolution. If an image is merely "larger than 2 MB", that could easily represent something that is already compressed and would not benefit from further attempts at compression. Of course, JPG is lossy and offers a size-quality tradeoff, but it doesn't seem like the greatest idea to make that decision for the user silently.

Aside from that, I would argue that a user who has such a large image and does not understand anything about how to reduce the file size, should probably be discouraged from trying to upload it. Especially on Software, where such an image would most likely be a phone picture of a computer screen showing code - which is highly sub-optimal.

I object: Never discourage a user from using your site. If you do, you have a site for yourself all alone very soon or not growing at all.

In terms of a more general UX advise: If there are size restrictions there should probably be a function (a button) to automatically resize and compress an image to fit that constraint. That is totally in the spirit of "ease-of-use".

On terms of humanity: Arguing that people should be excluded because they lack a certain type of skill, is also not in agreement of a code of conduct that aims on integrating people with disabilities (in the broader sense). You know, if you enforce alt-tags on images for those who have problems discerning them, it makes sense helping those who do not know that a screenshot has a certain file size or how to use gimp to resize them.

Antares‭ Karl wasn't arguing for the exclusion of people, he was arguing that users should be demanded to think more thoroughly about uploading specifically an image.

I do not agree with him that simply hard-blocking people because of image size is the correct way to do it. In case the user did think it through, yet wants to proceed, they can't. Additionally, using the file size to decide whether or not to demand more thought from the user, is the wrong metric.