I began to look for a convincing way to calm myself. How can you be sure that the fiat money you’ve sent to the exchange is really sent to the right address? It is necessary to feel safe about it.
Matbea.net saved me. This is a free service with quick registration. I rechecked it again and again, no deception. Thanks God the address that I was given with the exchange really belongs to Coinbase. Sigh of relief. All is not in vain.
New deposit addresses on the exchanges are being generated by user request.
No way they can know them if they are not in the block explorer.
So, in short, your strategy does not work at all.
Additionally, you have the ability to generate as much addresses as you like. In the original bitcoin whitepaper Satoshi Nakamoto suggested to use a new address for every deposit to protect your privacy. Think about that.