"can you please explain how?"
Because paid access games are existing so that people can not try the game or do anything in it until they pay. You don't get to have 10 free minutes at an amusement park, then you can go buy your ticket or leave. You have to buy it right away.
And it WILL ruin beta testing games because beta testing games are supposed to have a little amount of people in it so the owner can keep track of everything, but when users can simply join the game for free, even for 10 minutes, it ruins the circulatory flow.
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