How is it a scam? It is not like they charge people to use it. Not every program is going to work on every system. No one forces you to use Keychain, no one forces you to use Hivesigner, or to use any of the password managers out there. You can always copy and paste what ever password is required.
You want a BTC/HIVE Ramp, me I don't care.
Have a capital day.