There are a few cases of ads that might not be practical to remove, though most of that would be more like sponsors and ad content that is a part of the show. You can certainly get live sports without ads, though you will of course still have the pauses in the game that allow the ads in the first place. But it's not unusual to see e.g. the halftime in soccer filled with analysis on public television that doesn't allow ads in that circumstance.

And ads for their own services are still ads.