Are platypuses good house pets

No. This is completely untrue, and also impossible. It is illegal to have a platypus as a pet, and you would not be able to provide the conditions it needs. It would die very quickly as platypuses are highly sensitive to ecological changes. Platypuses are native Australian animals, and therefore protected by law. They are not permitted to be kept as pets in Australia or any other country, and this will not change.