The advertisements are incredibly annoying, and are surely designed to be that way.
The absolute worst thing about Free Spotify is how frequently ads interrupt playback. Get ready for annoying ads with Free Spotify If there’s a blue shuffle icon next to the playlist title, you may only shuffle songs. These include popular editorial playlists, such as “RapCaviar” and “Alternative R&B,” and playlists algorithmically tailored to your listening preferences such as “Discover Weekly,” “Daily Mix,” and “Release Radar.” The songs on these playlists change frequently.
There is a caveat with Free Spotify, however you can select songs for playback with unlimited skips, so long as you are listening to them from one of Spotify’s 15 curated playlists under “Made for You” on the “Home” page.