Spotify’s chief content officer Dawn Ostroff is leaving the company as the music streaming firm lays off roughly 6% of staff, according to a memo sent by CEO Daniel Ek on Monday. Ostroff had spearheaded the company’s expansion into podcasts over the past few years. The audio streaming giant is cutting about 600 jobs as part of an effort to cut costs. In the memo, Ek said he was “too ambitious”...