Posting your band’s tour dates on Facebook doesn’t really even change your privacy status that much.
Whether you have a Facebook account or not, Facebook tracks you around the web. Data brokers sell your data. Your cell phone company sells your location and browsing history, etc.
People over-estimate how much not using any given social media app really matters.
Now granted, installing it on your phone gives them a level of data they wouldn’t have from a web browser. That’s probably why Threads is phone-only.