As a Roblox Developer, it is currently impossible to specifically target a foreign demographic.
One solution to this issue would be to expand the existing advertisement system so that users can either advertise globally, or target advertisements at specific geographical locations.
Roblox is now on a huge push towards globalisation of the platform, with Localisation being vastly encouraged; however, at this stage there are very few benefits to doing so and it is a lot of work.
By introducing targeted geographical advertising, this issue could be minimized; with developers able to target their recently localised markets individually and thus develop specific player-bases with these audiences. It would add a lot more incentive and reasoning for localisation.
An example of the usefulness of this kind of advertising is, for instance, if I had just localised my game to Spanish- right now there is no real effective way of me getting word of my game directly out to the Spanish Roblox Community; with directed advertising not only would I be able to effectively do this and let them know my game is now available in Spanish, but I’d also be able to tailor these advertisements to my Spanish market- using Spanish language in the advertising materials too.
Another example of the usefulness of this kind of advertising is that from what I’ve noticed, games are more popular in some countries than others- sometimes by quite a long way. This is generally due to Youtubers from certain countries or languages actively playing the game. Being able to target advertisements at the countries you know you have big player bases in would be extremely useful.
This would be a huge step forward, and would really enable developers to reach out to international communities effectively.