i know that linux kernel development has some corporate backers. the most problematic could be google, google has fuchsia os, i still believe that fuchsia kernel will replace android kernel eventually, at that point there is no linux in android. in the end, google wants more control of devices, fuchsia licenses are more lax.
microsoft may not be that bad, because microsoft is more like cloud company and uses multiple platforms. windows os is not primary product for ms anymore.
i don't think libreoffice is only open source project to charge something from users. i don't remember which, but some project had free version and premium version for additional support and/or cloud services. however, apple takes 30% cut from those app purchases, so are buyers of libreoffice supporting apple or libreoffice project.
edit: typos: fuchsia
microsoft may not be that bad, because microsoft is more like cloud company and uses multiple platforms. windows os is not primary product for ms anymore.
i don't think libreoffice is only open source project to charge something from users. i don't remember which, but some project had free version and premium version for additional support and/or cloud services. however, apple takes 30% cut from those app purchases, so are buyers of libreoffice supporting apple or libreoffice project.
edit: typos: fuchsia