Yeah, I'm from catalonia and I'm ambivalent about this kind of usage. On the one hand, you have some meme sites that are cool, but are often just "exploiting" the tld to make for a nicer url. Aesthetics. As a hacker, it doesn't seem a problem at all... but then you have to consider the cultural issues too: catalonia is not that big, with 7.5M population. Should we consider the "inappropriate" use of .cat domains as a form of cultural appropriation? Might seem a bit exaggerated, but it's not a ridiculous question to ask oneself.
That being said, fundació.cat is allowing the sites to exist and doesn't seem to care that much either about what's going on in their domains (I sent them an email once asking for a list of all / the_most_popular .cat sites to find sites in catalonia worth promoting, and they don't even have that kind of information available), so if they don't care themselves, what can lowly citizens even ask for.
The objection isn't to using content from Wikipedia, the objection is that .cat websites are supposed to include Catalan content and this one chose to satisfy that requirement in the laziest and least interesting way possible. Why not pull from an article about something actually interesting and relevant to the site at least, rather than a couple intro paragraphs in Catalan about the place where most speakers of that language already live? It's not a huge deal but it seems like a missed opportunity.
That being said, fundació.cat is allowing the sites to exist and doesn't seem to care that much either about what's going on in their domains (I sent them an email once asking for a list of all / the_most_popular .cat sites to find sites in catalonia worth promoting, and they don't even have that kind of information available), so if they don't care themselves, what can lowly citizens even ask for.