Well if you ask anyone who says bitcoin is a scam, how bitcoin works, they have absolutely no response because they have absolutely no clue how it actually works.  I remember when people use to say this to me all the time back in the 2015/16/17 days.  My first question to them would always be "Okay, do you know what the blockchain is, or can you explain how it works"..never once was any single one of these persons able to do so.  So, there's really just a lot of noise out there.