The community will decide which platform they prefer. If this instance provides good content, it will grow. Maybe add it as related community to the subreddit before leaving for good if you believe nothing will change.
You are not representing the majority of the community. The user don't want to participate in the protest and you know that. Otherwise you would have opened a poll for an indefinite blackout.
The community will decide which platform they prefer. If this instance provides good content, it will grow. Maybe add it as related community to the subreddit before leaving for good if you believe nothing will change.