What happens when you get one do you have to pay something?
and if you want to give it to someone does it cost something?
The subscriptions are paid for by the giver, so the recipient does not have to pay anything - he receives the subscription for free.
The idea behind it: viewers who are already subscribers can also support the streamer - so they pay additional subscriptions.
These can then be distributed selectively or randomly to other viewers / followers. The streamer gets his money, the recipient a free subscription, and the giver the good feeling of having made two people a little happier.