Why is a pixel blocked and what does that do?

pixels get blocked for a simple reason, since its a javascript code loaded from a standard url, privacy technologies can simply block the url and thats its no more pixel case in point https //connect facebook net/en us/fbevents js the url above is the facebook pixel code its always the same url, for everyone so an ad blocker? they just don't let anything load from that url no code loaded, no data tracked, nothing for facebook to pickup the result of this is that event data is not sent cookies aren't created so all in all? you're flying blind through the marketing world