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I did the same and it is working fine. There’s just 3 things that are missing in maestral if you don‘t care for the productivity stuff like comments etc.:

1) No overlay icons in the finder (see https://github.com/SamSchott/maestral/issues/443)

2) No incremental sync for large files where just a few blocks change (the API does not provide this)

3) No support for extended file attributes (so you cannot sync .app bundles)

Does it use the file provider api or something similar? Or does it just download everything whenever it changes?

Using it and it works quite well. No issues so far.

Same. Very lightweight, does its job.