I’m not sure if you mean to imply that most US vehicles aren’t sold in Europe, but I don’t think that’s the case -- there are plenty of US cars in Europe (including Teslas, although they’re going rapidly out of fashion).
Either the design is fundamentally incompatible with European regulations, or they just don't think there's market demand. But note that other US truck do sell in Europe and the UK, e.g. the F-150.
There's something special about the Cybertruck. The special thing seems to be that it's a lemon.