Stuff I'm listening to, or occasionally stuff my friends are listening to. Uploads will be irregular.
I try to avoid uploading stuff that's already out there in HQ, ignoring Topic uploads. Not only are those sometimes viciously region-locked, they occasionally get deleted and reuploaded (presumably due to some shift in the rights). Link rot is bad enough with user-generated content, you don't need your playlist getting hacked to pieces by Beggars Group.
I provide links to buy the album and support the artist where I can. Every dollar you spend on Bandcamp Friday is worth 250 Spotify streams. If you buy a single and then pirate an album you're probably still in the black compared to your lifetime streams.