RTX 4090 48GB longevity

Modified 4090 48GB has been out for a while. I remember a lot of people were buying them at the time. A lot of people were also complaining that they are meant to fail, that they scam etc.

I have a few questions to people people who bought these.

1. How is longevity of these cards? Do they still work without issues? Any failure rate?

1. Do they use the same Nvidia drivers that regular 4090 or 4090D uses?

1. Are these cards Linux exclusive?

1. Are you able to run them in windows or Linux with other GPUs like 5090 etc?

1. Do you do anything to cool VRAM on the back of the PCB?