Try this
- Decline the ongoing chat clearly and identify only the essential plans you still need.
- Agree on a narrow update method so another person is not expected to forward every message. Keep optional conversation out of that arrangement.
A worked example
“I’d rather not join the chat. Please send me any essential plan directly.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Name only the updates you need so opting out does not create an unlimited forwarding task.