Why isn't there a strategy to grab the private key from the exchange.
And it would look funny (no) if exchanges issued private keys to their users. Why didn't any of them think of using this as a marketing ploy?
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
"Each of our user has a private key! - The safety of your cryto is in your hands."
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
In fact, technically (issuing a private key to each user) this would create an additional burden for the exchange. Including money, because you would have to spend transaction fees (and time) when transferring from one address (user) to another (user) within the exchange. And so, now everything is done within the
shell of one exchange.
Issuing a private key to users by the exchange would not add reliability and security to the safety of crypto assets, but, on the contrary, would reduce it. So it's a pointless idea.
After all the bitcoins are mine.
But
No. Bitcoin can't belong to anyone. You can only obtain the right to temporary ownership if you have access to bitcoin (if you have a private key).
Why are there no exchanges giving users private keys?
Because no one needs something like this (neither exchange users, nor the exchange itself).