"usage" and "content" are part of a list following "information about", so they are collecting information about content, not content itself.

What exactly that means in practice, we are all just guessing unless you go and ask them to clarify. Probably things like what settings you used for your videos so they can analyze which features are most popular/worth improving.

At least in the EU, if this EULA was not clearly accessible/communicated on the store page before purchase, it would just be invalid, and you'd have a case that the product doesn't work. They're banking on people having more important things to do and just clicking accept to use their product...

> "usage" and "content" are part of a list following "information about"

Sure, but that is preceded by “including but not limited to”, so that is a non-exhaustive list of examples.

That's the correct reading but I'm not sure just how much leeway "including but not limited to" tends to get. Does that, in practice, mean "things like the following" or does it mean "literally anything"?

It refers to the previous section of the same sentence, these things are given as examples of "technical, diagnostic, usage and related information". It'd be up to a court to decide whether something not part of the examples could be reasonably called that.

It means "things like the following". https://applawyers.org/blog/10317283