This website is up and running for a long time. I recently noticed there were nearly 20k subscribers. I don't think there's any benefit to being a Subscriber here unless you actively post comments. So I'm confident that most subscribers are spam. I simply removed any subscribers who never posted comments. Free feel to let me know if I accidently remove real subscribers, I can restore you on request.
Please be aware that subscribers who never made any interaction will be removed periodically.