what is moatads.com and why it access data on my site???

Replies: 0

AdBlock blocked GET-request from addthis to z.moatads.com:

addthis_widget.js?ver=5.4.1:70
GET https://z.moatads.com/addthismoatframe568911941483/moatframe.js net::ERR_BLOCKED_BY_ADBLOCKER

I need explanation from plugin team:
– what is z.moatads.com?
– why third-side persons have access to data from my site?