I had that for a few days, then it started counting down videos I could watch before they blocked the video player from loading.
For now you can enable extensions in Incognito Mode (I'm using chrome), turn on your preferred ad blocker and it still blocks ads that way and you get no pop ups.
I'm still doing this, had no issues so far and just having an Incognito Window open just for Youtube. Not had a single pop up, black screen or any sort of warning.
Ad-less and still no need to sign up to Youtube Premium.