So if yahoo was starting a campaign that promotes killing puppies, you would join that based on the fact it is managed by yahoo?
No of-course not. I certainly did not mean that. At-least I have developed a sense of awareness that if someone keep doing mistakes then I can sense it.
Well, yes.
Let's take the off chance that yahoo's account gets hacked and it isn't noticed (while the chance might be very low since yahoo uses a strong password and doesn't do stupid things, it does exist).
Now the hacker (prentending to be yahoo) launches a campaign that promotes, say a phishing version of WalletingServices (used to reclaim forked coins, currently running a forum ad, thus reputable service),
that phishing version pretends to be WalletingServices, but is only set up to steal private keys from users.
Would you, based on the fact that this campaign is managed by whom you believe to be yahoo, join the phishing campaign without doing any kind of research?
At that point, you'd be an accessory to the scam due to sheer stupidity and lazyness.
Again no, I would not. The worse case could be like ARBITAO, without prior knowledge I may join but then when I will be well aware of the scam and if I know that the account got hacked then I will leave the campaign without even informing the yahoo account owner (the hacked owner). And if I know for certain that yahoo account indeed is yahoo's then again I will inform him that I am going to leave his campaign after x amount of time or immediately. All depends on the situation.