I think this is the correct analysis - the focus should be to provide vaccines to the rest of the worlds nations that have not yet gotten widespread access to vaccines. This is likely to cause the greatest benefit in the form of fewer global deaths, and reduced global spread of the disease.
But developing countries pay less, so BionTech and Pfizer will have less profits. As cool as having a company like Biontech, run by immigrants, founded in Germany they always rubbed me the wrong way in terms of PR and business conduct since the start of the pandemic. With huge support from German media and politics. The continued dissing of Astrazeneca is just one example, the push for booster shots is another.
They never commented on AZ. You can not blame BT if everyone wants "the best" for themselves.