Likely this was pilot error or deliberate. Close family member is retired B avionics tech, and has lots of stories about these planes and crashes. Training issues and lack of keeping maintenance up on planes has been a factor is many of these "accidents". One story from his co-worker whom was overseas training customers. He caught workers on a 737 wing with shovels removing ice.
The 737 Max was the curry nigger engineer design that has a habit of falling out of the sky.
The 737 max accidents were down to bad Boeing design. This was 737-800 so probably won't find out until the black box is found.
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