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Reasoning:

.com is the best TLD by a long shot but it's really saturated, so as a startup you have no chance.

As you say, the hope is to make it and be able to buy the X in getX.com where hopefully you've checked that X belongs to a squatter and not an existing company (they're both bad the latter is worse).

My personal favourite is PostHog, which sounds like something one might say on Grindr.

It doesn't just sound like that, it was used to mean exactly what you think well before PostHog was founded. I'm still not sure if that was an accident or the founders were in on the joke.

I am obviously incredibly ignorant (not that I’d normally think so — but here I have no idea!) but I can’t think of what this means.

Would you mind explaining please?

Hog is slang for human male genitalia. Given that, the company's name is an imperative command to share photos of such.

Grindr is a hookup app for gay men. "Hog" is slang for penis, so one might ask someone to "post hog" if they would like him to send a picture of his penis.

It worked for thefacebook.com.