Because with certain Algos like Dagger Hashimoto or whatever that algo was called for ETH had a crappy build in miner called ethminer.
I used it in 2016, it basically made all my rigs freeze during the epoch change, there was also no monitoring, no dual mining, etc.
I rather pay claymore the 1% fee for the stability than deal with ethminer. Sure it was closed source but he had a reputation and they were all on rigs with no private keys or anything.
Still using Claymore? I thought the developer vanished from the earth.
No, nobody used claymore for like 5 years but the point I was trying to make was that at the time it was the best miner you could use.
He didn’t develop it for free and due to that he made to make it closed source to get the fee. If he made it open source, everybody would just move the fee to 0% and he wouldn’t make as much money.
None of his miners had viruses or malware. People used it for years and just trusted him. Plus like I said before. It was all on headless rigs with nothing installed except the miner software. Nothing to steal from those systems.