Is this normal for a startup? Experience with Y Combinator backed company

I recently had an interview at a Y combinator backed start up and made it through to the second stage at which point they requested I sign a NDA with a non compete for 12 months. This is the first start up I have applied to, having worked in consulting/banking for 5+ years and I thought this seemed aggressive to include a non compete before a job offer was made. I asked to clarify that this should only apply if a job offer is made or if it applies with no job offer that it could be shortened. As a result they have now ghosted me and I feel gutted that I messed up my chance by quibbling on an unenforceable NDA term as I was passionate about the product they are building. The other strange thing is that they have everyone working in the office 6 days per week. Given the aggressive NDA, ghosting of candidates and 6 day per week in-office policy do you think I have dodged a bullet here or should I expect this from everywhere? Was it unreasonable to question the NDA?