A realisation I had a few years ago was that differential accessibility to websites is quite likely market segmentation technique, whether used intentionally or otherwise.

A website that only works on recent kit in high-bandwidth locales with low ping latencies and little packet loss ... acts much the same as a posh high-street address does in dissuading those people one would prefer not to have to face with or address.

(There may be a similar logic to truly atrocious web deisgn, intended to dissuade (literal) tyre kickers, as with LINGsCars: https://ello.co/dredmorbius/post/7TOJTiDEF_L4r_sdBRINGw)

Though this explains the behaviour, it doesn't excuse it. And might well form the basis of discrimination or accessibility lawsuits.