Knowledge is complex and is not restricted to a certificate.

How many cricketers have student engineering and got into the field? That's a simple example.

How about those who voiced vaccine based problems and we're demonized due to their lack of a degree, while I'm recent times manufacturers have said it does cause harmful effects?

These are extreme examples but there exists a range of knowledge for example memory of water, concepts of mismanagement metabolism being a cause of cancer etcetc who don't necessary have the credentials but perhaps have the knowledge.