Mine is this: I have tracks that aren't available on any streaming service. I've also been buying music on CD since 1993, and online for 10+ years and have over 120k tracks which will never "become unavailable". My playlists will never disappear. I'll never pay another cent for them this music for the rest of my life. The money you pay to rent music each month, I use to buy another 2 albums and a bunch of tracks, so my collection constantly grows in the direction I want it to.
Bandcamp makes much more sense to me. Listen to music online as often as you want for free (without easy custom playlists that I know of, although they make some playlists and it is easy to play a bunch of music from particular publishers) and purchase if you want to add it to your collection (flac format) or support artists.
I used to have a huge selection of MP3s with obscure and non-obscure music of my tastes that I've painfully curated over the years and I listened using an MPD server.
I'm glad I decided to keep the collection behind when I changed computers because Spotify is so much more convenient. I don't have to worry about downloading music or having the right device connected to the right server, and I've found more obscure tracks that I liked in 3 years of Spotify recommendations than in a decade of randomly going through the Internet.
google music being shut down and youtube music being a terrible replacement was enough to push me to set up my own plex - loving it so far. I run it off a raspi.
Plex is fantastic except the direction they seem to be going with how they monetize is questionable. Streaming from private servers is definitely The Way though, in any case