I loaded a private web address using Chromium with the extension WOT v2.6.0 (by www [dot] mywot [dot] com).
Hours later, some unknown ec2-x.compute-x.amazonaws.com IP probed my private address.
I repeated the same test with another unique private URL, and hours later, the same ec2 IP loaded that private URL again.
Then I disabled the WOT extension in Chromium and repeated the same test with a new unique private URL. No more probes.
Bad WOT! You should just be checking whether a link has bad reputation instead of loading the web addresses I’ve visited.