Sure they aren't, the difference lies on what they do with the data.
While Google will use that data to show you harmless text advertisement, the FBI might use it to backup a phony case against you, that can ultimately put an end to your freedom.
I'd say that's an incredible difference. Wouldn't you too?
Still, you cannot know everything they do with that data. They show us the advertises, but what else are they doing? What guarantees do we have that they do not sell or give out information?
I'd stay both sides are bad. We may see them as completely different things, but you have to agree, in both sides, what we see is just the tip of the iceberg.
But only one of these can lock you up in jail for whatever reason they want whether or not you're guilty. Besides, if you want to avoid having your data collected and possibly sold without you conscent just stop googleling your thoughts.
Now, the real question. How to avoid governments taking over our rights?
While Google will use that data to show you harmless text advertisement, the FBI might use it to backup a phony case against you, that can ultimately put an end to your freedom.
I'd say that's an incredible difference. Wouldn't you too?