What overlay? That looks like Windows 7 with the Aero theme disabled to me.

It doesnt even matter, TTL is only decreased when routing. Ethernet frames have no such concept.

I see why automatically giving them out (like in ACME) would be a bad idea, but other than that, why not? Even https://1.1.1.1 has a DigiCert cert.

There are more reasons, as LetsEncrypt might be more restrictive on what you can get (for example, you cant get a certificate for an IP address from them). But, as 99.99% of usecases do not require anything like that, go with letsencrypt until you know of a reason not to.

Note that Git doesnt store deltas. It will reuse unchanged files, but stores a (compressed) version of every file that has existed in the whole history, under its SHA1 hash.

Just wait for the trolley to pass and then enable an autoclicker