Usually their videos have an info box below the title stating they’re part of our public broadcasting system and explaining what it means :)

Regarding the buggy mess: I often find it becoming unresponsive or the UI glitching around. For example when changing from dark to light mode and vice versa the text often becomes unreadable. Or when switching from shorts to regular videos the tab bar often becomes unresponsive. As a result of the glitches I was able to get PiP a couple of times even though I’m not on the Premium plan. They might have already patched this though.