In the perfect world, there will be no comission at all. But frankly, I see that some exchanges have already decided to do that.
Take note that in this world, no one is perfect 
. Your words are quite exaggerating but that is the truth. We are not in a utopia where all things are perfect. If you don't want to pay fees, either use both you and the receiver the same app (have tried this we are using the same app and there has no fees) or don't send your BTC at all. Fees are there to compensate the miners so paying the fee is needed.I found a post, that it could be highly likely that the big part of the exhanges will do that soon. https://cryptogeek.info/en/blog/free-transactions. Sometimes, I gotta admit, that I can spend relatively a lot of money on the comission. I hope it will change somehow. I don't know how the other users can put up with it. Is there any legal way to avoid the fees?
A good way to advertise your article "MAYBE".Legal way to avoid the fees? I don't think that there is a way to do it unless like I said use both the same apps. There are some who doesn't require fees if you are using the same but there are some who will require you to pay fees though. Just accept it that fees are always there and there is nothing we can do about it. We are not in a perfect world like you said
.