Does this car have rear drum brakes instead of discs? If so, worn or out of adjustment rear brake shoes can mimic a failing brake master cylinder.
Inspecting the rear drum brakes should always be the first step before replacing brake hydraulics.
If the car has rear disc brakes then this does not apply near as much.
Some issues I have with what has been done.
One does not replace the same part 3 times, or 2 times, in an effort to cure a problem. This is wild guessing.
The other issue is they’re “clamping” the brake hoses? No way on earth should this be done with what I assume is a pair of Vise-Grips. Expect a brake hose failure, or worse, in the future. That’s a horrible thing to do.