Interesting because the repo only lists a MIT license, with no mention of those requirements. IANAL but those license terms don't seem to be anywhere in the software repository.

https://github.com/basecamp/once-campfire

That's an outdated license web page dated 2024, see "Copyright © 2024" at the bottom.

The code was made free in 2025 per X post dated Sep 12, 2025 by Jason Fried [0], screenshot available [1].

A quote from Fried's tweet:

  Campfire...it's now 100% free...and open source.

Here's a quote from https://github.com/basecamp/once-campfire/blob/main/MIT-LICE...

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction...

[0] https://x.com/jasonfried/status/1966559597117964560

[1] https://files.catbox.moe/98t9vx.png