Might be useful for self-hosting when you’re away from home and don’t want to open your ports up to public internet traffic. Also whistle blowing is kind of in public interest. And circumventing regional censorship. Depending on the country the latter two might not be fully legal but it’s best if it stays this way. Hiding yourself from prying eyes of ISPS google and so on is also fully legal and important as you can be geolocated often to a few hundred meters without it.