IANAL but I'm pretty sure those examples could still be trademark infringement. Since Google is a global company and brand, someone could easily assume since y

IANAL but I'm pretty sure those examples could still be trademark infringement. Since Google is a global company and brand, someone could easily assume since your site is called google.scuba or googlescuba.com, you are in some way affiliated with or endorsed by Google. Perhaps you'd be OK if you made it very clear that wasn't the case, but I wouldn't want to bet on it.