Wait till you aren't a teenager any longer, you'll see it
EVERY MMO requires a sub be set up. Same as MANY other services that have a free trial (like amazon prime or the various movie services). Whining about it makes you stand out as being either horrifically insolvent (in which case why are you playing computer games, you otherwise have my sympathies) or young enough that you shouldn't be playing (considering it's an 18+ game) and having to beg your folks credit card.
It costs nothing, you enter details, cancel in the first month and pay nothing else. The rest of it is standard practice as used in practically any situation where a free trial would normally be followed by monthly payment. Get over it.