I've literally had contractors working for certain BigCos tell me the companies insist on a 90 day due date on all invoices (at the end of the month of services

I've literally had contractors working for certain BigCos tell me the companies insist on a 90 day due date on all invoices (at the end of the month of services rendered, ofc) and will still always be late on payments because they know that they can get away with it.