How do cracked premium apps (like Spotify) really work? Where can I learn cracking such premiums?

So same question as above. I know some bit of cracking and reverse engineering cuz of the few challenges I have done on crackmes.one but I am not sure how to crack such premiums. How do the cracked app works?

submitted by /u/imvedant04
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from hacking: security in practice https://ift.tt/3RrGoY1