To my knowledge all of these upgrading services utilize hacked family accounts to make the upgrade (thus the low price) and there’s none or very few out there that use legitimate accounts to do the upgrade despite whatever these people say. That being said I’ve used services like this one before without issue, but the premium went away after a few months or weeks and it’s at your own risk.
I didn't know hows Spotify system works out. So it is just basically a hacked family account, and our account is just added to their list?
Anyway, if that is hows it works doesn't its the opposite of the forum guidelines, or we can't know for sure it is a hacked account?