Brc20s is a "protocol" lol, a really hack way of emulating erc-20's and making tokens by using jsons inscriptions. Creating them looks like this. He created them with the ticker "ordi", he created 21 million maximum of them, and you can only claim 1000 at a time.

Sooo, basically you make them for free, and only pay a transaction fee. And grab some yourself. Others grab some at the limit you set and hopefully value it, because crypto, now the tokens you own have value like a premine.