One reason is that IP’s can be more granular as another user pointed out. OTOH that doesn’t always work so well, either - I often get pinpointed to a location some 100km from where I actually am.

Another reason could be to circumvent people’s privacy or rather anonymity settings.

And since others brought up search engines etc., there’s a third reason: I always use English on my computer, but I am not in England. It’s nice to still get localised results (DDG has a drop-down to change this on the fly though).