Bitcoin mining doesn't normally use GPUs. They use dedicated ASICs. Far more effective, and cheaper in every way.
In addition, AI is in the "growth at any cost" phase. There is a TON of investor money to burn, with little need to show future profitability.
Are they from China/Chinese clients? A number of these are modified to never seed, so they always show as having 0%.
If you are a complete hard-liner, you're going to run into one very particular, and peripheral, obstacle: your employer will almost certainly issue you a Windows laptop. It may not be a large part of your job, but it will be there. Very few companies will offer a Mac, and even fewer will offer Linux.
You might have to work as a freelancer, taking on tasks that can be done without Windows. But even something like web dev will require testing on Windows.
Little need, but not no need. They need to have a vague path, and something to show for it.