I don't understand. You will trust it only if you make it yourself?
1,827 karma · joined February 15, 2019
How do you even implement an ua check? How many browsers do you know? How many browsers you don't know? How do you implement an ua check for a browser that will appear tomorrow?
I wrote my own http downloader. Do you know about its existence? How do you implement an ua check for it? Can I call it "wget" to make ua check easier for you? Can I call it "Mozilla/5.0" so that it's compatible with your ua check so that you don't need to change anything?
If the police retrieves your money from the thief?