Document additional features/functionalities in exchange for money

Before using an app, I would like to know any features/functionalities it has that are only available in exchange for money. Otherwise I can spend a significant time installing it, only to find that it doesn't suit my requirements. The scope of this issue is intended to include any difference whatsoever in behaviour in the paid version, including "nags" or "different configuration options".

For example AFAIK:

1. OnlyOffice has a Premium model, with a key feature (editing on mobile) only available to paid users, with a license fee of €149 (Jan 2024) for home use, €180/year business.
2. Collabora office has a much more flexible model. In addition to the paid version (enterprise), there are 2 free versions, one limited by "nags", the other limited by scalability (home use). There is evidence of an undocumented configuration option that appears to bypass these limitations.

## Original text
(incorrect use of language - but preserved because the discussion below references it)

There is already the "Ethical AI rating". I propose that we could have another similar rating for "freedom" / FLOSS, which would apply in the case of Apps that require external 3rd party code. There could be further text that provides details of the freedom restrictions and how to choose/configure any relevant settings.

For example, it could work a bit like this:

- Entirely FLOSS would be green.
- Free = "Scalability limit” could be a yellow. This encourages funding the project from enterprises (who are making money and would otherwise pay the likes of Google), which is probably the most desirable from a user perspective.
- Free = “Nag-ware” seems like an orange. This is targeting ordinary end users (who could get a free, but-non-private service from Google), but it’s still usable.
- Free = “Key feature limitation” would be a red. The free service is barely usable, it's basically paid software. Perhaps these should cease to be “featured” apps, or even removed from the app store.

Collabora would count as a yellow overall, as they offer a yellow option (although it's not well documented). If they only offered the orange option that would of course count as an orange.