Is it though? I’m not sure the various Mongol empires are exactly your typical tribal people. I’m not sure you can even call them tribal people at all in the modern sense. They were an empire spanning a vast region of the world at one point.
If the government was trying to funnel money to vaccine companies they’d just make the vaccines free and pay for them with government funds, forever. That makes a lot more money than having the companies try to get people to fork out 100 pounds for them.