Any stealing act for anything to anyone is still illegal wether it is online pr not.All stealing avt is considered a crime as long as you dont have permissions of the real owner
The real owner? Who decides that if it's possible for me to generate the same address? Just because I generated it after shouldn't mean it's illegal. It's not like exploiting an online wallet to steal private keys and drain the accounts.
I feel like you guys are just guessing to be honest, I want to know if it's legal or illegal to take bitcoins out of an address you just generated.

I dont think stealing bitcoins can be caught because when you steal bitcoins you cant do anything with it because he is untraceable so the owner of that bitcoin does not know that you have his bitcoin,