Speculatively, but it would assume prior research, which many people simply wonβt do. If a de-facto app (say Voyager on iOS) offers a default option thatβs unavailable for a selection of its potential users, itβs another hurdle within onboarding that is already the biggest barrier to entry. If we want to grow as a platform (more users equals more content), putting up a default wall saying βyour kind arenβt welcomeβ to entire countries seems obtuse.
Yes, those potential new UK users can get around it by picking another instance, but the question is how many will give up if they canβt get over the first hurdle.
The suggestion of changing the default instance by region, where those instances prohibit specific regions seems logical enough to me.