Then you should probably renew the expiring cert.

If you pinned the leaf cert, you're fucked in any event. If you pinned the CA, it's problematic for something to automatically choose a new CA for you.

Doesn't matter, you'll need a new certificate either way.

Your point isn't bad, you just ignored/overlooked the 'expiring' part of the announcement.

If you don't pay for the renewal, pinning _probably_ is broken anyway (unless you somehow pin a cert, but ignore validation. In which case you should've used a self-signed cert from the start, I guess).

Honestly, I cannot see a downside to this. People that won't pay the CA mafia will get a cert for free. TLS everywhere. The internet wins.