Earlier quoted context omitted.
I'd wager the income from playing gigs would be substantially lower if you weren't on Spotify.
Your arguments veers close to the "for exposure" payment. People don't go to indie concerts because of a spotify track. Nor to big name concerts. And 20 cents corresponds to around 50 to 100 plays according to the numbers mentioned here.
While it does, note that paying or doing stuff free "for exposure" is exactly how many artists got big and huge hits were made, from payola to DJs (starting way earlier than Alan Freed with radio DJs, and going all the way to EDM DJs being paid to break a track), all the way to paying for artist ads or record shop placement, buying fake streams, followers, and views to appear more popular and drive exposure, or doing for free (or, often, paying for) the support spot on a bigger band's concert.