So if you start making chairs using wood you find in a forest close to where you live and selling them on Marketplace, I can come over, enter your garage and just take them without giving you a cent

No, but you're free to come over and use your fancy chair copying machine to make a copy and keep that for yourself while still leaving me the original. If you like the chair, I'd appreciate a donation, most people think $x is a fair amount.

you would rather have your cake and eat it too

That's how digital copies work. You can have your cake and eat it too. You can make infinite cake for essentially free.