Google thinks it's OFL v1.1 https://github.com/googlefonts/atkinson-hyperlegible?tab=rea... But it also has a Reserved Font Name, so probably OFL-1.1-RFN going by the SPDX License List https://spdx.org/licenses/

Kinda too bad they don't just state which license they're aiming for.

Infuriatingly, they didn't actually use the same text but they introduced multiple tiny changes so that you're forced to check word-by-word whether it's still an open/free license.

Was it really necessary to replace "Original or Modified Versions" with "The Original Version or Modified Version", or "Reserved Font Name(s)" with "Reserved Typeface Name"? So necessary that you're willing to sacrifice potential reuse?

Yeah, I wish they would just keep the boilerplate OFL intact. I spent way too much time trying to figure out what the "real" license was, and if I could use it in my open source projects.