I've had Youtube Premium for as long as I can remember. I subscribed to Google Play Music, and they had a promotion for free Youtube Red with a subscription to GPM. I've kept it continuously since then, for free, and I've never seen an ad. I forget that Youtube even has ads until someone else puts a video on. I've also watched a lot of Youtube. I've seen every RedLetter Media video at least twice. This is all anecdotal of course. Maybe I've just gotten lucky.