sapka.pl is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
Antropic didn't lose 80 billion in the last quarter. Their operating loss is "only" 8 bn (it's crazy to say "only," I know). The rest of their loss is how much their shares promissed to other entities (like Microsoft) grew in value. 72bn is the hypothetical value of how much more they would need to pay then to rebuy the stock. It's a good thing for them, actually, and this is why money is meaningless and Wall Street is a huge joke played on all of us.