Question: how is LinkedIn useful to you?

For me it’s just a non-stop swarm of recruiters from India who want me to kindly listen to their offer of a job that pays less than I’d make picking up garbage, utter sociopaths dredging up some psychotic hustle culture nonsense, and previous people I’ve worked with/for asking for favors, which of course means free.

Is it somehow more useful for an actual business?

I wouldn’t argue with the dude; he’s got a clear case of bad-faith-itis. What you did was bad, so you shouldn’t have done it, but no I won’t tell you how to fix it.

The absolute best you could have done is cross-posted to a Mastodon/Bluesky/whatever account as well, but you can’t just always go around yanking the rug out underneath communities especially if you’re in a position where it’s not just lazy shitposting and worthless commentary.

…that said, you have moved anything you can to being posted somewhere in tandem riiiiiiight?

As with all things email, they probably really wanted to make sure that the mails were delivered and thus were using a commercial MTA to ensure that.

I’d wager, even at 20 or 30 or 40k a year, that’s way less than it’d cost to host infra and have at least two if not three engineers available 24/7 to maintain critical infra.

Looking at my mail, over the years I’ve gotten a couple hundred email from them around certificates and expirations (and other things), and if you assume there’s a couple million sites using these certs, I could easily see how you’d end up in a situation where this could scale in cost very very slowly, until it’s suddenly a major drain.