Why can't I hear more than 4 songs before commercials?

[ams927]

Because I do not subscribe to Spotify Premium I am finding that listening to Spotify is worse than listening to the radio. There are way too many commercials.  Every 10-15 minute interval has 4 songs and 5 commercials. Spotify never used to be this way but lately it has gotten bad. I understand the need for commercials. But is it really necessary to play them after only 4 songs each and every time?