No relation between Bitcoin and scam, because simply the scammers use fiat and cash more than Bitcoin and scammers tried their operations before the creation of the bitcoin crypto currency as known
Have no meaning to do such connections. The scammer can scam with everything and with every money. He scam there who find possibility to scam and these kind of possibilities are more out of bitcoin because ever the amount of people which are his target is bigger and have more possibility to earn more and for a log time. then have no meaning in itself to make such correlation. It is like to make guilty the bread because the bread maker has make it with expired flour.