I can't even imagine how many secret services monitor what's going on right on Telegram servers.
I doubt that anyone can have any trust in “secure” and “private” communication service that got banned in Iran only to be unbanned 3 days later. They were not so soft on other big names they banned. The outcome? Telegram is the most popular messaging app in Iran, and no one is searching for anything better. Perfect place to oversee the public.
The thread is about a place where your "offensive" community can be hosted without the owner overlords coming an declare it a hate-group, in case you missed that.
On these other platforms, the users seem to think that, in the name of "free speech" everything is allowed everywhere. So on other platforms that tried to host it, it's full of off-topic posts. The don't respect the rights of a group of people to carve out an area for themselves.
Someone just needs to launch it on their own website, and hope the ISP doesn't pull it, or the DNS provider doesn't refuse to resolve it, etc.
The existence of other groups/channels on telegram with other rules is completely irrelevant. If people are unable to switch between communities and respect the different rules in each then that's their problem and you just remove them.
Maybe you need to sit down and think about if that is entirely consistent.
You cant call for violence or show violence, like gore content and terrorist videos do get removed. Everything else is fine (for now).
Download the app from the website not form the stores to avoid googles censorship.