I did some googling and came across this advice in another roku thread. It didn’t work immediately but then I came back to the roku later and for now it is working. Hoping it fixed the problem of not seeing scary ads since I’m now just seeing a mostly blank box with the word “test” in it. I think restarting after the change should help you test it.
Advice copied from Reddit user Hookbeak:
“Doesn’t work on every roku but try this to remove ads:
Access secret menu 2 as follows:
Home home home home home up right down left up
Choose “cycle home screen ad banner server” and click ok until it changes to “staging 2”
Home to exit.
Ads are replaced with a nice blank box”