I see, I don't think I have changed my password for a couple of years, so what you say makes sense.
Then you must have also had a fairly weak password too. Anyways, that your account was compromised has nothing to do with spectrocoin.
Perhaps the other users whose avatars were changed might also have old passwords?
It was mainly some sort of scam to get people to put money into a bitcoin account supposedly on coinbase for some sort of signature promotion.
No. Your account being compromised has nothing to do with spectrocoin, and what spectrocoin is doing is not scamming. Spectrocoin is operating a signature and avatar campaign where they pay people to wear their avatar and their signature and make posts. Whoever got control of your account decided to enroll the account in spectrocoin's campaign and then make posts so that they could make money.