Does it mean every CEX is a risky place for our coins?
Yes.
Using of Centralised exchange services for decentralised coins like bitcoin completely diminish the it's usecase and what security you except from it?
The CEX have their own terms and they will operate on their own terms and see them as business entity who have to comply with the government regulations to keep their profits running down the line without even thinking of your privacy for a moment at all.The governments always want to track you and so these CEX is risky for you undoubtedly.
Also yes. A government "monitoring" or otherwise regulating an exchange doesn't care in the slightest about the users of that exchange or the safety of their coins. They don't care if the exchange has terrible security, or if they are hacked, or if they have risky business practices, or poor cash flow, or go bankrupt, or anything of that nature. They care that the exchange is collecting your KYC data so they can spy on you, and they care that the exchange is paying the relevant taxes. That's all. As I said in my earlier post in this thread, regulation or government oversight absolutely does not mean the exchange is safe.
Exactly exchange doesn't care about your safety and security and they want to increase their profit share only with increased customer base and government support.They will be putting restrictions on you each time you make transactions and KYC is what they are making mandatory these days so being anonymous is not a option for you at all with these CEX.
Bitcoin fees are often 1 sat/vbyte, which equates to a few US cents. Hardly an excessive price to pay for security.
And fees will only depend on the size not the amount you are willing to transfer unlike to your traditional monetary system that charge high fees with lot of documents to make big transfer but in bitcoin we see how whales make million dollars transactions with normal fees payment and yes you can pay it with RBF also and usually the transaction is settled fast.