This post originally appeared in Sergej Müller’s Google+ profile (in German) and is no longer accessible there. It’s now kept here by the Pluginkollektiv.
The AntiVirus plugin for WordPress has an option to perform malware detection using Google Safe Browsing. Google Safe Browsing API is used for this purpose.
The daily limit (free use) is 10,000 requests/day, which was still within the limits at the beginning, but is now generously exceeded. Now I am (once again) facing the (re)financing of one of my plugins and would not like to bear the costs myself (when the time comes and Google asks me to pay, which is also legitimate).
If need be, I would of course step in financially (with the number of requests always increasing, see graph), as is already the case with Antispam Bee. But it is not really nice 😉