I think many channels offer that, but most of the groups that I see are either paid or some special invite necessary to access it. Paid groups are somewhat sketchy because of the "claims" they have, and that's just the tip of the iceberg when it comes to produced stuff. I think another betting group or something is also reselling it. Repeating signals all over, and I think I saw that, but that's mostly with signal groups for trading.
Thanks for your invitation. I do think it's nice to have a place where you can share bets or something.
Most of those free and "paid" betting groups are scam. Like 99% of those. They just do random predictions or like you said, copy pastes "signals" from other group. The free/trial groups are for baiting people. They give 1 or 2 correct prediction, people think they are legit and then end up joining their premium group which is filled with nothing but stolen/useless signals.
Not worth joining those groups. Do you own research and place your own bets!