Hey there! I'm new to the forums but have been playing RS for almost a year now. I saw your comment/question about the loss of free gem ads and wanted to let you know that I've experienced the same problem. I sent an email to support since I was thinking it was some sort of bug and just heard back from them the other day. Unfortunately, it looks like this is not a bug but a new change they've implemented to "adjust the game's economy and balance to ensure the prolonged quality of the game for both new and existing users." (taken directly from the email I received).
Totally stinks that we lost those ads but it does make me feel a bit better to know I'm not the only one who has had this happen.