Many people have had a similar experience in this thread that Roku very helpfully just locked without resolving the issue.
https://community.roku.com/t5/Channels-viewing/Random-accounts-logged-in-to-streaming-channels-that-...
In that thread I posted the following:
I found this thread after Googling because my mother just had the same issue. She has a Roku stick and never had a problem until today. She downloaded the Paramount+ app for the first time (never used it and never had a subscription). When she downloaded the app it was already logged in to someone else’s account with an email address that we didn’t recognize. What in the world Roku? There is a serious security hole somewhere and based on this thread this issue has been going on for over a year with no resolution.
I came back to post an update:
My mother discovered that she does know who the account belongs to. Apparently my cousin downloaded and logged into his Paramount+ app when he was at her house over Christmas. However, he deleted the app off of the Roku when he left. My mom has been able to reproduce the issue as follows:
- She downloaded the Paramount+ app from the Roku Store and it was not logged into my cousins account. It asked her to login as expected.
- She then deleted the app again.
- Later she saw an ad banner on the main Roku menu for a movie she wanted to watch. It was a Paramount+ ad for the movie Smile. When she clicked on the ad, it downloaded the Paramount+ App automatically and was already logged into my cousins account.
So there is some kind of bug where the Roku is remembering the old account that was associated with the deleted app, but only when the app gets installed via the ad banner and not when it gets installed normally from the Roku store.
hope this helps in troubleshooting this issue.
