Window managers in Linux take direct command from the display server (Xorg, Wayland, etc.) to decide where to position windows and what they should look like. Whereas "window managers" on MacOS/Windows are tricking the original window manager provided by the OS into positioning windows a certain way. I'm simplifying here, but hope that clears things up.
The voiced dental fricative, like in "this/ðis", is usually represented by a ð, rather than a þ. Which is usually used for a voiceless dental fricative, like in "thin/þin". Had to learn ðis as a foreigner living in Iceland, as Icelandic still uses boþ characters.
You are misunderstanding the problem. John Oliver, like Veritasium in the post's video, is talking about the health risks of PFOS like C8 and GenX which are PFAS used in the production of other PFAS like Teflon. PFOS are able to enter the bloodstream and have proven carcinogenic effects. However, although PFOS are used in the production of Teflon, they are not found on a non-stick pan. Teflon molecules are too big and too inert to enter the bloodstream and will simply pass through the body when ingested. So scratching a non-stick pan and eating the flakes wouldn't really do anything, I don't think I'd have to prove that by doing it.
Teflon (or generally big Fluoropolymers) are not the problem. Ingesting them does nothing to you, because as long, chemically inert polymers they just pass through you from one end to the other
Not always, here are some paid open source games on itch.io
Although not all of them are free as in libre, developers are encouraged to charge for free software.