I joined .world when there were only about 100 of us (was trying to find a nice small server to settle on, so much for that!), and rolled up my sleeves and went full-time tech support for like 2 weeks to help with the influx. So from that pov:

• When the Reddit exodus started (slightly earlier than people had anticipated), .world was one of the only instances that didn't require a proper application to join.
• There was a bug where acceptance emails weren't being delivered to Gmail addresses (probably some others too but for obvious reasons Gmail was noticed first). That meant people waiting for their applications to be accepted on other servers didn't realise they had been. As well as this some people were just impatient waiting in general so gave up on their original instance choice and joined .world instead.
• Other instances also started to close registrations completely due to not being able to handle the scaling. World wasn't handling it great but Ruud specifically announced he wouldn't be closing signups, which is one of the reasons it became the default recommendation while everything was on fire.
• There was a thread tracking how quickly we were growing, I remember us celebrating 1000 users and then a couple weeks later 100,000! And that was kind of exciting so I can't blame people for wanting to be part of it.

The best part is, I was the one who reported the Gmail thing to Ruud after seeing the admins of another instance had figured out a fix. I remember saying it was good we'd noticed it now, before the influx "next week" (ie Reddit's scheduled meltdown). Turned out, he had no idea that was about to happen at all and the timing of setting up .world was just a total coincidence! 😆

Edit: This was only like six months ago and recounting the tale to all you whippersnappers is making me feel like an old grandma telling tales of the war.