I agree with you. I think for Episode Races or other events or challenges there should be an option to discontinue to take them. I do not wish to take on next Fast Race. You can suggest this in the Ideas Section.
I don't think she is being slippery at all. She has just told us that the Sugar Drops will stay as they are until mid-August. I think individuals are frustrated irrationally. My interpretation is that Jelly isn't 100% sure hence why she said 'mid-august and not giving us specific details when it is going to end.
I've earned rewards from Sugar Drops. I don't know what people are complaining about. I don't see anything wrong with it. Is Sugar Drops harming the game? If not, why complain for this? I think people just wat to complain.
Here are further links talking about Build-a-Bot: https://community.king.com/en/candy-crush-saga/discussion/comment/366729#Comment_366729 https://community.king.com/en/candy-crush-saga/discussion/250614/build-a-bot-boosters-available-for-previous-levels/p1 I hope this helps.
@Sukanta_Biswas has beat me to it. Yes. It is a feature that the game has not putted yet. If you see any Events or Challenges missing it is because the developers have took it for a while.