Haven't had the A7III but have had the A7RII and A7RIII with similar rated shutters. they've all been fine.
And tbh Americans will sue companies and start law suits almost out of nothing. Trump going to court over election fraud is prime example of this.
who cares if you have real actual evidence
Also I find it hard to believe that Sony is not keen doing a recall and fixing faulty shutters for free because they have done several recalls on lenses in the past inc. one recently
for the newly announced 35GM lens. Doesn't seem to line up.