It should be noted that this particular site works without sending any data back to the server. Aside from that, this is one area where web-based applications

It should be noted that this particular site works without sending any data back to the server. Aside from that, this is one area where web-based applications excel: You can inspect and limit what data an application is sending away about you via your browsers built-in dev tools and extensions like uMatrix (or your own request-filtering extensions).