The crash video only shows the last 1-2 seconds but in reality the plane seems to plunge spontaneously, then recover a bit and climb and finally plunge again.

It's not identical(this plane doesn't have MCAS) but it tells a similar story where the plane nosedives, recovers a bit and nosedives again - which is quite similar to the MCAS situations. I would say, the primary difference is that MCAS crashes happened during take off, on this one during a cruise.