Do they have experience building a company?

They aren't out right rejected, the bar is higher because there is only one of you to do all the things. You have to show that you can hire and delegate and make positive progress.

10 year experience in industry and 2 year experience in running a startup with 8 employees

I think it's a bad blanket rule.

Founder conflict is a major risk for an early-stage startup failing, so having the wrong co-founder is more dangerous than going at something solo.

Exactly my thought. Why should the founder be forced to give 50% of equity to someone for doing something he can do himself alone.

Are you worried about dilution? Why does it need to be 50%?

Usually the idea goes 50-50 split between founders. Unless the guy with the idea has an upper hand in terms of traction or mvp built.

Is this yours?

https://linkish.io/

Looks like yet another bookmark app

Yeah it is yet another bookmarking app but much more than that. I am not sure if I am allowed to market the product by listing its features here but I can connect with one-on-one and tell about it if you are interested. I am very new here so don't know how HN works yet.