What does it mean when someone gives away on Twitch subs?

Sometimes I saw that someone gave away 100

This means that someone spent 5.49 euro * 100 and 100 random viewers are now a sub a month with the streamer

You give away subs, what is not there to understand, then the 100 gifts are free, so to speak, with the person a sub

You can follow and subscribe on Twitch! (Follow = Free Subscription = Paid) If someone gives away 100 subs, he has given 100 people a paid sub and pays for (only one month)