Coins

I have the same, just 40 gold, in one of my three games, the other two still have 45. We must be part of a test group that only get 40. King do run tests from time to time and assign players to different groups with different prizes for the same events. Why they do this.....I don't know.

Playing on an iPhone mobile app still 40 coins, no videos for additional five coins

I think these are two separate issues you have @Enjoy37

The 40 coins for the champions race is something many of us have now. King are testing this out and may decide to roll it out for every player or may go back to 45 coins for every player. They make changes like this on a regular basis. They do, as part of their game management, hand out different events and prizes to different test groups. It is common practice for all sorts of events in Candy Crush. Another example is the differing "legendary" prizes some of us get in the Hungry Hatchling event, and the top win streak boosters are different for different groups of people as well.

The disappearance of videos is also part or King's strategy and is discusses in this thread

I was reduced to 35 for over a month and after putting it in a comment it miraculously went back to 45 last week. Hope this comment doesn't revert it back to 35.