Nothing. This is a 22 year old aircraft that's changed hands a lot[1] and is flown hard. It's a different aircraft type too...

Every time an aircraft, let alone a Boeing, has a failure, everyone starts to point out every other situation too.

These two situations have literally nothing to do with each other.

[1] https://www.airfleets.net/ficheapp/plane-b757-29610.htm

The only thing in common is Boeing made the plane. Literally every other detail is different. One was clearly a mechanical failure in an old, heavily used aircraft and the other is likely a some kind of unexpected automation behavior.

Possibilities for Air France include but not limited to: misconfiguration, failure of sensors, programming fault, electronics failure, or pilot not expecting the automation to be in the mode it's in—which could be a training issue, pilot error, or failure of the manufacturer to document the behavior.

There was also the Chinese 737 crash. It might be just a coincidence that it's all Boeing's, it might be poor maintenance due to the pandemic, who knows.