It is difficult to stay completely anonymous in the current generation where each and every device, app, website is tracking us in some way or the other.
There are people who prefer to stay anonymous and use anti-trackers to stay away from being tracked.
Talking about me, I try to stay as anonymous as possible if at some point I have to give up anonymity in order to get ease of access and convenience then I do give it up.
For example using binance to get access to a larger volume of coins for trading. I do give anonymity in such cases.
Apps are tracking you but they can only track everything. They have only the data that you give them.
When you go to a store and pay with bitcoin all they have is date and time of the transaction and the address that was used. They don't have your name and address, your date of birth, they don't even know if you're a man or a woman.
That's where the harm of KYC comes into play.
They force you to give them that information so that it can get associated with your wallet and your wallet with your online activity. Suddenly they know that your coins came from a signature campaign, they know your forum nickname, post history. You post about a hardware wallet that you use, you give them other exchanges that you have account on because you post about it on the forum.
KYC is worse than a tracking app.