We did the pineapple for Rylie thanks to YT! Granted she only did it a handful of times... but I wasn't keeping THAT habit up. She LOVES the pineapple. We use it for training treats and she thinks she's getting a reward.
It has worked for us so far... at least I haven't seen her have any interest in it since. Then again, she only did it a few times prior and not consistently so who knows! I'm going to just keep it up anyway just in case and she also loves the stuff and it isn't bad for her... so why not?