BUT, and this is the key part - buyer teams from major brands vet the supplier, make cost/quality tradeoffs and do all the supplier due diligence (like making them attest the products are not made by "modern slavery", don't have lead in them, etc). They also squeeze them super hard on payments and financials.
The BEEZELBUBS and QRYGGS are mostly the SAME factories that have always been making your goods but now they are "out of the box" and can sell to the consumer directly.
The good part is that they can now compete "fairly" outside shelf space monopolies, the bad part is that no one seems to be doing supplier due diligence or addressing quality fade.