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you're essentially giving pow shitcoins hash power in exchange for bitcoin. it's not very profitable since eth went pos. they allow for btc withdraws via on-chain or lightning.
the windows tool is here: https://github.com/nicehash/NiceHashQuickMiner
you're also trusting the various bundled miner applications too.
their lightning node is here:
https://amboss.space/node/037659a0ac8eb3b8d0a720114efc861d3a940382dcfa1403746b4f8f6b2e8810ba
dyor of course. i don't personally use the service any longer.
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I didn't see that option, all I found was this. And the gambling/scammy-looking easy mine