What can you say about this??
Can you really believe a good project with good concept would forcefully invite you into their community without any prior notice??
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Good projects will never use the services of spammers like this to add members to their groups, good projects will have their own ways to attract investorsAnd they advertise with this added telegram participant who are not aware they are part of the group. They are serious spammers as you rightly said more-also, many investors are victims when they announces they telegram group numbers on social media like Facebook, the announcement goes like this:
"Congratulations we have just pluck over 35,000 members on our telegram group". No wonder they use PLUCK, really its pluck because they do that in a dubious ways.