The fear of actual subliminal technology embedded within media, in my opinion, is overblown and usually stemming from paranoia. If a company does attempt this, it is at huge risk as there are legal repercussions. So this isn’t usually an issue, and if something subliminal does slip through, regular subliminal usage with our subliminals minimizes any potential impact.
Plus, there are much more important thing to worry about. As @SaintSovereign likes to point out, people like to rave against subliminal usage, potential subliminals in media, “occult” influences, how it’s anti-input any religion here, but then turn around, watch and dance to lil Nas twerking on Satan.
While these are different methods of input, make no mistake, that still has an effect on you - and it is much more common, mainstream and accepted - and it’s not just songs, but in general social media, movies, etc.
You want to be protected from such influence? Focus on the things you can change at the moment, which is the content you consume.
Finally, I’ll add that, as one naturally develops and grows as an individual on all levels, one loses the pull towards such content and anything else that affects him in a weird or negative way. This is especially noticeable with subliminals (usually alpha titles, spiritual titles and sometimes social titles that attune you to the more hidden aspects of human social interaction) and genuine spiritual traditions - although through different, yet related mechanisms.