I know people have a stigma that they think their "cards age" will decrease if they're used for minging 24x7, with bitcoin mining I agree a 100%, but now no one does mine Bitcoin GPUs, people mine Ethereum on GPUs, and Ethereum is Memory Intensive, I mine with my 2080Ti, at a 70% fixed fan curve, and at -200 core clock, the only thing that might wear out are the fans, which also might take a good 3-4 years, and are really cheap to replace.
And definitely do mine with your 2070S, you'll make a decent passive income, just do your due diligence about which pool to mine to and tune your overclocks to the ones that are being suggested online