Let’s see a few of the major events relevant to our discussion:

1. 2013 is the year Google decides to sunset Google Reader, a (if not the most) widely used web feed aggregator (for RSS and Atom feeds);

2. 2013 is the year Google decides to close XMPP server-to-server federation in their Google Chat service; Facebook will to the same with their Messenger product the following year;

3. 2013 is the year Google first proposes the removal of XSLT, a proposal that is so unpopular that it will continue receiving comments against it as far as 5 years later (the last comment in the thread is from 2018);

4. 2013 is the year Google removes the just-introduced MathML support from Chrome; it will take 10 years and an external company to bring MathML support back into the browser.

That’s a rough year