Say, my hobby will not relate in anyway to my work (that's quite obvious) but also not about personal development, nor about maximizing my "potential", nor about peer pressure, nor a way to make passive income or how it'll help me in my life in the future, because that'll be the best recipe for burnout. Those business/self development jargon words can stay within 'work' realm. Your hobby can have those features of course, if it comes naturally, but I will not put it as priority as to WHY I choose something as my hobby.
Hobby for me is purely hobby. Things I can lose myself into and not worry about ANYTHING ELSE except things in front of me.
P.S. My day job is high-precision graphic designer, my hobby is clay sculpting. There's something calming and relaxing about its low-pace nature — unlike digital hobby though.