SoundCloud
The streaming may be 128kbps, but you can make your music downloadable in 320kbps or whatever MP3 encoding level you want, or you can just upload in lossless format instead.
Bandcamp
You upload lossless, and people can DL the format they want. MP3s from there are downloadable as either 320kbps or VBR0.
If you're concerned strictly about higher bitrate streaming (as opposed to downloading), I'll join the popular sentiment: the demand isn't there, and the difference to the ear isn't practically discernible. As bandwidth capabilities rise over time, it'll eventually happen in the same way FLAC has grown as an increasingly offered downloadable option, but the baseline standard of quality is currently phone earbuds, so it'll require a sea change of sorts in maybe 5-10 years.