I noticed that if I open, say 20 tabs and later close all but one, there are still 20 processes, so I have to use taskkill /f /fi "imagename eq chrome.exe". I

I noticed that if I open, say 20 tabs and later close all but one, there are still 20 processes, so I have to use taskkill /f /fi "imagename eq chrome.exe". I searched to see if this was a known issue and found this discussion. Someone even suggests that Google uses Chrome to use our computers to calculate index of cache in the background then send the results back to Google... Don't be evil? What do you think?