Are there any good examples where a single founder made it big, truly on his own? You can imagine that maybe Drew could have done it without Arash, or Gates cou

Are there any good examples where a single founder made it big, truly on his own? You can imagine that maybe Drew could have done it without Arash, or Gates could have done it without Allen, etc. But they didn't, which validates the exception. So before we casually say /oh if you don't feel like you need a co-founder then don't bother/, it would be good to know if any single founders have been successful. And maybe we should define success as financial/market success, not emotional fulfilment or getting your first two round of funding.