Any ads are inappropriate for my kids (and myself, for that matter). It's distracting, misleading. There's zero benefit, only potential negatives to thought processes and attention. I don't subscribe to any ad-based services and make sure they have ad-block properly setup on any devices (on Android this means Firefox with uBlock).

And in general, stupid content is far, far more worrying than "inappropriate" content. I'd rather have my kids see some nudity than many of the "kids" shows out there.