I haven't heard of any successful company that started like this. Websites like cofounderslab are mostly wishful thinking. People create a profile in the hopes that somebody with a lot of money and time will come and give them an amazing opportunity. Nobody is actually interested in risking it all for a startup. They just want somebody to make their lives easier.

Finding a cofounder is harder than finding a girlfriend. And once you commit, you're married for the lifetime of your company. So don't try to actively search for a cofounder. Because the odds are against you. Instead, start by yourself and see if interest builds up in time. It's much easier to find partners after things start rolling into place.