Why limit yourself to only liking acts that are popular worldwide? I find it quite bizarre. If I like music, that’s all that counts - it doesn’t come into it how popular they are worldwide, here, or anywhere.
Plenty of hugely popular acts here struggled elsewhere, Oasis struggled to sell arenas in the USA in their prime, as did Queen in the 80’s. Glastonbury aren’t going to book a hugely popular UK acts just because they don’t mean much in Belgium