I bought Premium, partially because YTMusic works well for my audio streaming.
I haven't seen an ad in several years. I like YT more than most "regular" TV shows and movies, so it's worth it to me. Back in the 90's my favorite TV shows were This Old House and New Yankee Workshop - well presented content, with minimal drama. My favorite YT folks are woodworkers, machinists, engineers, rocket scientists and so on - they deliver interesting content, with no drama or BS.