There are no vendors, Telegram issues those numbers. So it's basically a pass to create account w/o mobile number requirement, if you're ready to pay for it.

Interesting, https://www.theverge.com/2022/12/7/23498236/telegram-fragmen...

> To get an anonymous number, you need to go purchase one through the Fragment blockchain... Durov calls Fragment “an amazing success” that already generated over $50 million in sales in less than a month.