Well sure, if they give a discount on the mortage for a bundle approach I don't see that as a problem. If however, they made it a conditon that may be an issue. Trouble is though, on one hand we have Westpac providing the plumbing for APT to become a bank, yet we also have Zip saying banks are also being anti competitive. If one bank won't touch you with a BNPL account, enquire with one that will bank you. There are numerous mortage providers.