This is called trust farming and buying trust.
It is not tolerated on this forum so it is a valid reason for a note about this user doing it.
Some DT will tag the account with negative or a neutral to warn of this activity coming from that particular account.
It is offensive to pm people out of the blue and ask them to do it. That is proof for you to give to the DT member though if they ask for it. Which they will to have evidence of this questionable activity.
To be honest, i'm not sure if it is real message, or provocation to pull me in this not nice activity.
I'm almost sure that this is alt account, and this user will ask for trust feedback for another account.
In one moment i wanted agree to this proposition to find out what is real account of this trust farmer, but I was affraid that someone is just testing me, and finally I could be in trouble.