I have no affiliation with Nexon of Fyber, but I can attest that I recently completed one of the propotions for "Mobile Strike" and the enormous pile of crowns appeared in Dominations immediately after completing the requierd level in MS (within 2 minutes).
In other news I found playing Mobile Strike immensley boring and can't really understand the attraction. The game balance was insane (the equivalent of Atomic Age players could attack Iron Age players, and paid-up Iron Age players could wipe out freeloading Inducstrial Age players; I do understand that at one level, without payments the games would not be developed, but it could be more subtle or less unbalanced, or perhaps just limit the development levels of freeloaders), the play style was simply "follow the prompts" and "click, click and click", with very limited strategy.
But Fyber did work.
Dave