Just saw a website that's an 'open educational resource' project database... it's built on a proprietary tool, CraftCMS. On the CMS website: "We use (and contribute to) some of the best open source tools out there, allowing us to focus on the parts that make Craft, Craft."
So the CMS, built on #libre is not libre. They're citing their open source dependencies (virtue signalling) but celebrating their lack of libre. Promoting 'open education' with closed tools. Ugh. Proprietary is not cool.
Here's why proprietary software is not admirable: https://davelane.nz/proprietary