I guess no answer so far pleased you but here's what I think and I tell you from own experience with the old version of the game. (desktop)
This is just my idea so might not be real but it have a good point I guess. What about if the x2 bonus is not connected to all the ads companies like Matomy, Supersonic, SuperAds, etc?
For example on the old desktop version, under the game window I had some ads for boosters and money and the ads was always from the same provider "Supersonic" in my case. I never had from another provider.
But you should know that the videos per day limit applies for everything, tokens, boosters, extra bonus, etc so if you passed the limit no chances for more videos...