NO. Having Klaus´s mentioned setting set you become a subscriber to the thread when you ANSWER a post in that thread OR when you have CREATED the thread. Just "reading" don´t create a subscriber...
Leaving some spam comments on a thread is NOT like "just reading", @LucaMs
Ehm... Let's say I believe you ... SPEEDY ... I had not realized that just reading, etc..
Spam? Definitely, because now that I know how to remove the "automatism"... I have reactivated it! LOL