highly unlikely you will find anything for $750 that will even be able to fairly compete. Its even kind of interesting you think its possible which sort of denotes a latent desire to have the $750 sound as good. I guess its a common fantasy.
Nobody said they thought a $750 amp would compete with an amp 10x the price — you made that up in your mind somehow. We’re all just wondering how the Mini GaN 5 sounds for only 750 bucks and need other amps to compare it to is all.
May be be a dumb question, but couldn’t another designer/manufacturer buy the Purify modules and incorporate GaN devices in an amp on their own?