My university definitely had expulsion as a punishment for plagiarism but it was rarely used in the first instance, especially on undergrads or in cases of coll

My university definitely had expulsion as a punishment for plagiarism but it was rarely used in the first instance, especially on undergrads or in cases of collusion with other students rather than something like essay commissioning. If you were caught plagiarising a major assignment I don’t doubt that you’d be expelled, but a small coursework (especially in first year) would have probably just been zeroed out or you would have failed the module.