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This can be effective if the group admin can attach this thing. But if the admin has to take so much pressure to manage a group, it will discourage him a lot. Again, it is important to think about creating a group and if someone is a victim of a scam because of that group, he should take responsibility for it. Everyone in the crypto community knows that there will be more scammers in Telegram. So it is difficult to manage a telegram group.
I don't think it will be his responsibility. Unless he's the one that scammed the member. But if not, he will not be accountable of the lost money of the Telegram group's member.
We should know that it is our own responsibility to be careful and mindful of our assets. If we got scammed, it is mostly ourselves that should take the blame. Not other people.
I think it's his responsibility to make sure that no scams are promoted in his group. Since he has posted here about his group, if someone is the victim of a scam in the group then that member will post here. So now we are warning this member so that he does not have to face any big problem in future. He can create groups and add members if he can keep the environment of the group scammer free.