I've read your responses OP tho not the entire replies, but what strikes me most is what you are doing is the same as
Going into a shop and paying the shop assistant to be nice to you, to take an interest and chat to you.
You say you are gifting less and so the niceness/interest/chat have decreased.
You pointed out yourself that this streamer, or as I would call him "CON ARTIST" actually phones you at home around the time when he knows you will have just been paid.
You said you were in this group because you are friends with the other responders, but most of them are obsessed with this Con Artist and are stalking him, but you are not.
I don't think friendships with these other people, if they are obsessive and stalkerish, is doing you any good at all.
You have a child, every pound you give this useless bastard is money taken away from your child's well being.
You keep saying that you weren't invited to this meet up. Its glaringly obvious that the Con Artist is doing this to draw you back in, punishing you with less attention because you "disobeyed" him by reigning in the gifts and he's hoping that this will make you willing to start up again to get back in his good books. Be honest with yourself because that message is coming across loud and clear in all your posts.
If you keep focusing all your attention on this streamer and the meet up to such an extent, you will get hurt, and that will affect your child.
He already has your home phone number, and probably your name, address, birthday, child's name, social media etc....in chat over the time you have probably been conned into revealing so much information about yourself to this Con Artist.
You have put yourself in a very vulnerable position, he could be selling this info to online fraudsters, its exactly the kind of information they need to extract money from people.
You need outside help to detach from these people. This is not your fault, these people have honed their skills at drawing you in.
You said he's actually instructed you not to block him, and you seem to have obeyed. He is an abuser, even though he's online, it is easier to cut ties than if you lived with him.
Please find help and detatch from this group for the sake of yourself and your child.