It was their idea since the beginning. To make everyone take vaccine and keep the track about those who doesnt. It will make even bigger gap between poor and rich ones. Rich ones if they take vaccine they can travel and do whatever they want while the poor countries that cant make to get vaccinated are going to be isolated from the rest of the world.
To be honest, I don't know where you got that idea mixing vaccines and the rich/poor gap but it makes no sense. It's more about ideology: the sheep and those who resist, who protest. We have seen restrictions imposed on individual freedoms, de facto compulsory vaccination, etc. for a virus whose overall mortality it's below 1%. This is not about rich and poor.