Is targeting a worldwide audience for AEO campaigns a good idea?

Question

Up to now, we have always done one campaign per country, and from time to time we have combined several small ones. Since our target audience is very specific, I now wondered what would actually speak against a worldwide audience?
If I do AEO campaigns e.g. for the purchase event, I don't care where they come from as long as they buy.

Answer 1

If your ads contain text, this isn't a good idea -- you won't be able to localize the ads at the geo-level if you run a worldwide AEO campaign.

Answer 2

You should exclude from targeting countries in which users obviously will not make purchases. The language for ads I would recommend to choose English. Also, I would recommend combining some countries into groups by CPI, ARPPU, and perhaps language.