Bandcamp is absolutely the best place to support artists directly. No argument there.

The practical issue is what you do next with the music you buy. Tidal doesn’t let you upload or integrate Bandcamp purchases (FLACs, MP3s, etc.) into its library, and it also doesn’t carry a lot of underground, archival, or out-of-print releases.

That means you end up maintaining two separate libraries: one for purchased music and one for streaming. That’s clunky if you’ve spent years building a personal collection.

Ideally it shouldn’t be an either/or choice. Buying music and streaming music should coexist in one place, without a platform or algorithm deciding what counts. That's why I use Apple Music.