Yes, you can. But if encryption is illegal, than steganography is illegal, too. Which means that big companies looking for advertisement money will not struggle

Yes, you can. But if encryption is illegal, than steganography is illegal, too. Which means that big companies looking for advertisement money will not struggle to offer you an out-of-the-box solution. And this will make a huge difference in itself - I'll let anyone judge whether she considers such a difference good and worth the hassle.