Ask HN: Launch app with/without incorporating a company?

I'll be launching an app in a few weeks. Most likely it'll sink without trace.

Is it safe to launch an app without incorporating as a company? (In the UK it's ~£20/$30 to provide a firewall between law suits and personal assets).

Y Combinator suggests that you don't incorporate before applying. Have any HN applicants lost their house through this advice?

I understand that HN readers are not lawyers. I'm not expecting advice, just a discussion of relevant topics.