Cambridge Dictionary:
> censor: to prevent part or the whole of a book, film, work of art, document, or other kind of communication from being seen or made available to the public, because it is considered to be offensive or harmful, or because it contains information that someone wishes to keep secret, often for political reasons.
Miriam Webster definition:
> to examine in order to suppress or delete anything considered objectionable
If I automatically delete content merely because I think you won’t be interested in it, I don’t see how that counts as censorship under the standard dictionary definition.
That said, you are of course entitled to your own opinion of what the word means. But please don’t be surprised if I think you sound a bit melodramatic suggesting that Google is carrying out censorship by automatically deleting emails offering me cheap viagra, especially when I can still see these emails by clicking on a link or reconfiguring the rules.