... what they have done is lazy and unprofessional, but it seems to reflect the isolationist attitude that the US industry is adopting these days...
Well, Imgur CEO Alan Schaaf's online name is 'MrGrim'
Anyway, what you are experiencing 'Mog, will become SOP for US tech firms as the UK and EU tighten their rules. (Its not a Denial-of-Service Attack, perhaps a Denial-of-Service Self Harm?)
AFAIK, the last British photo service was Fotopic.net (which went down 15 years ago). Maybe some new ones will start popping up now. In the meantime, you might experiment with European photo services ... although only the Swedish sites seem to also operated in English, eg:
--
https://www.fotki.com--
https://jalbum.net/en/There used to be an English section for Bilddagboken.se (now Dayviews) but I'm not sure if that still operates.