Gabe Kangas has some stuff to say about Roku:

I plugged in a Roku yesterday, and it’s already the device that’s had the most blocked advertising and analytics requests on my home network. One day, and it’s made the most gross requests compared to everything else that’s been monitored much, much longer.

I haven’t run any Roku stuff in my house for a couple of years, but this jibes with my experience. When I did have two of them, they were far and away the worst offenders on the Pi-Hole block list.