I like this idea. As a user, I hate that companies force me to make an account in situations where I don't want to make an account. It sounds like companies that use your product will allow me to buy products from someone without having to create a damn account.
Accounts are negative value for most customers who don't regularly return. It's a source of friction: who hasn't forgotten the password for a site their rarely go to then decide it's not worth doing the password reset (even if you use a password manager, it might not stay updated for "junk" sites)?
Plus, junk sites are the ones that tend to get pwned, and leak information.