https://www.ufc.com/news/ufcr-nombra-stakecom-como-primer-socio-oficial-de-apuestas-en-america-latina-y-asia
But as you can read(and eventually translate with Google) Stake.com is the official betting partner of UFC for Asia and Latin America!
Draftkings is American and thus advertisements are seen mostly by that region on t.v ads and don't think they're available to those customer's base in Latin America or Asia/Europe for that matter.
https://sbcamericas.com/2021/03/04/draftkings-and-ufc-forge-ground-breaking-sports-betting-partnership/
"Can you play DraftKings in Mexico?
For now, the only players who are cleared to play on DraftKings abroad are those who live in either Canada or the UK."
source: google
As we all know casinos are restricted by use by region only.
Plus Draftkings are operated as a fiat based casino if I am not mistaken and do not accept crypto currencies of any kind while stake does.
https://forum.bitcoingambling.io/threads/does-draftkings-or-fanduel-accept-bitcoin.58/#:~:text=No.,Mastercard%2C%20Discover%20and%20American%20Express.
Yet their other USA based casino rival does accept bitcoin cash (BCH) but we all don't see this as the real bitcoin.
https://news.bitcoin.com/fantasy-sports-giant-fanduel-now-accepts-bitcoin-cash/