u/Avi8tor-32

So I looked up a tutorial on how to bypass the Minecraft Java Demo and it worked by getting a command line and making a .bat file with it or smth. And it work, even though I dont have Minecraft bought. I also am able to get mods on it. But I cant join servers like Hypixel and it says that I have a invalid session. Is there a way to bypass this to join multiplayer servers?