Open Access is not a business model. It is about the Access, as the name says. The author pays is a business model, not the best one, and is the one with many problems.
See the Fair Open Access Principles https://www.fairopenaccess.org/ and the Publishing Reform Discussion Forum https://gitlab.com/publishing-reform/discussion/issues
> Open Access has its own problems, such as predatory journals, where researchers who don't know better or who are desperate to publish are more or less lied to as to the reach and validity of a journal.
This is not specific to Open Access, there are low quality subscription journals as well. No serious scientist would send articles to unknown journals without checking their credentials, whether the journals are open access or not.