I have a Pixel 4xl with the common battery ribbon connector problem.
Google replaced the battery once within the first year, and then again a year later. Then, a year later the problem came back. I went to the same store, and was told Google would not fix the battery again.. that after 2 times it's a motherboard problem and that isn't under extended warranty like the battery.
So I went on Amazon, bought a new battery for $18 including tools, and installed it as a first timer in 20 minutes. Works great.
Not every consumer is able to do that. So Google just burns them.
I should add, not being as flippant and careless as ubreakifix and google, I actually looked at how I could mitigate the problem from happening again.
The tiny plastic clip that attaches to the motherboard is brittle and breaks when the ribbon pulls on it as the phone flexs and moves around.
So I used some of the sticky tape provided to hold the battery down, to hold down the connector. So now when the ribbon pulls on the head of the connector, it has to overcome the tape before it can flex the connector and crack it. 9 months later no failure yet so it's too early to know, but I'd bet good money that adding a viscous gluey tape over a connector that was breaking due to flexing around would help keep it together longer. Why couldn't Google do that the first two times they wasted money installing a new battery?
So I went on Amazon, bought a new battery for $18 including tools, and installed it as a first timer in 20 minutes. Works great.
Not every consumer is able to do that. So Google just burns them.