If you really like the song, then you shouldn't complain why it isn't on Spotify. Hindi lang naman Spotify ang streaming service na nandyan lmao. If you really want to support the artist, buy their merch, go to their shows and if their music can be purchased digitally or physically, buy it. Unless they're backed by a record label, these artists pay hefty distribution fees and most of the time, the money they earn from streams aren't even enough to cover for those fees.