I agree - reg.fee
Google just like Microsoft are both WELL known for being the bullies on the block, stealing, robbing and taking advantage of financially "handicapped" companies, and get away with it. It's business in its most unethical yet purest form.
Even though google practically "stole" the adsense avenue, they are all the more aggressive to protect their loot by sending their attorneys out after anything that faintly smells like infringement.
just my personal approach: anything big company related, even if it's only one of their products, i leave my hands off.