If you are absolutely locked in to someone else's service, then there really isn't anything you can do if they do something object able, better to rip off the Band-Aid now than later.
X Formerly Known As Twitter isn't functionally irreplaceable, and I do hope the higher up at Nintendo will realize the only way that the only way to make sure they have full control of their publishing platform is by owning it and start a Misskey instance or something.