Qobuz recommends using Soundiiz.com, which transfers playlists from any streaming app to another streaming app, in my case Spotify playlists to Qobuz, Tidal or wherever.
It does also do "transfer, synchronize and platform to platform", but I just used the playlist transfer function. At the end, it tells you how many songs it was able to match to the new Qobuz streaming library. No actual file transfers take place.