> conspiracy theories
Conspiracies do happen from time to time. Unfortunately the term "conspiracy theory" is often used to refer to unreasonable theories that are more about reinforcing preconceptions about what ought to be instead of observing what the situation actually is.
Obviously it is important to check any theory, and extraordinary claims require extraordinary evidence. In this case, however, the claim that Google wants to get their hands on as much data as possible isn't an extraordinary claim. It isn't a conspiracy which is usually defined as a secret plan. Google is very open about their business model based on analyzing large amounts of data with modern techniques.
Calling concerns about giving even more data to Google a "conspiracy theory" not only ignores Google's business model, it also dilutes the term making an actual secret conspiracy harder to identify in the future.
> think about just how many people use Google search, Gmail, Chrome, Android, etc.
The only service that is similar to sending all of your traffic to Google is GA (Google Analytics), which most people are not using willingly. Yes, a lot of damaging analysis can be done from search/mail/etc, which is why it's a terrible idea to also include the rest of your internet traffic.
> improving security for average users
Google has done a lot of work to keep user data safe from third parties. Very little of that work prevents Google itself from seeing your data. When the default configuration isn't end-to-end encrypted, in practice this means Google is still seeing everything. Google even calls this a feature that is part of their "assistant".
> If their goal was to spy on people
So you don't think their business is based on spying on users in various ways for better ad targeting? Even though Serge Brin and Larry Page personally explained their intention to spy to CA State Sen. Liz Figueroa?
http://www.pbs.org/wgbh/frontline/article/the-robot-defense-...