Even I faced the same issue,
I made a dummy website for a client when i was learning wordpress, it has been two years i moved to a paid hosting and never checked this dummy,
But suddenly yesterday i got a mail saying i used my 50% process entry limit.
I’ve split this off into its own topic so you can get help specific to your problem, rather than mudding the water with the previous post (Why did I reach my limit?). Since their account was suspended and yours isn’t
By the sounds of things, your site may have had a sudden influx of visitors that caused you to reach 50% of the process entry limit. Even if you’ve never shared the link with anyone, the site could still be found and indexed by search engines.
The same advice that Meishin shared on the previous thread still applies here, and this article can hep you understand what’s happening.
Of course, if you don’t want that site any more, you can always delete it from your account and then it can’t reach any limits