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Maybe if it’s just a jolly roger with “*ARRR” under it. Those in the know will understand, for others it’s just a silly pop culture reference. And has plausible deniability (“What? I just really like Pirates of the Caribbean and Sea of Thieves!”).
Yeah this is my thought as well. I see nothing wrong with mostly surface level info for bumper stickers. However, I wouldn’t advertise doing anything against the law or hell, even less popular stuff then most. It unfortunately can single you out for potential vehicle damage or worse.