From what I've heard, I think Canadian companies have been asked by YC to re-domicile in other countries now as a requirement for YC to invest. I believe some Canadian companies accepted into YC have received notices about this but I do not have any details as to why and haven't been able to find any public announcement. Lowkey sucks for Canadian tech startups who will now have to pay additional fees for a new parent corp and can't take advantage of Canadian tax credits/grants.