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It's software as a service now. They host the forums.

Not exclusively, but they're definitely going towards that route. I'm still paying them huge amounts of money for the license to host their software on my own servers but people who do that is a shrinking population.

Running web software without updates from some unknown source doesn't sound like a very good idea. Lots of stories out there of communities using "nulled" software which got hacked because of a backdoor left in.

phpBB[1], vBulletin[2], and Simple Machines Forum[3] also still exist. The internet was amazing back then.

[1]: https://www.phpbb.com/

[2]: https://www.vbulletin.com/

[3]: https://www.simplemachines.org/

XenForo is made of former lead vBulletin developers. I see that a lot more than vBulletin nowadays.

cPanel most likely.