To the naysayers in this thread: You have several options here other than just saying 'oohhh, this is mean and nasty'. - match the offer with a better one, so all those that would take up the OP would flock to you instead - build your MVP, keep 100% and then do your own marketing. $5000 for 50% difference but you get to do all the work. Either one of those would be so much more effective than just berating the OP or…
Logical assumptions lead to a plausible candidate - but that's not identity.