Competing on better pricing/underwriting models, and modernized, streamlined endorsements of ISO forms is fine. (I can't speak to whether the actuarial and underwriting work you did is up to snuff, but will give the benefit of the doubt, and TransRe is a good company, as is Milliman). You probably didn't need to create your own PAS (hint...you've just just started! MTE are not the only hard parts...) but enjoy the challenge.
If you're doing by-peril, bit surprised you didn't try to collaborate with AAIS, instead of copying CAIC? AAIS loves working with startups, and they're a non-profit, member-driven organization. (Btw, delete the CAIC references from https://www.goodcover.com/files/Goodcover_Policy_Sample_Full... )
Surprised (did you? I don't see it mentioned in your Filing Memorandum, which it definitely, definitely should be) you got approval for "Goodcover's Invitation Thank You Policy," pretty sure that won't fly in NY. Your advertising should really say "up to" everywhere, as you (and everyone knowledgeable) knows you are not selling steeply discounted insurance across the board. (As you quite rightly admit, Lemonade's "$5/month" (including instalment fees!) offer is a loss leader, even if they can't admit that.)
Looks like your TOS was updated, still not happy about the blanket ownership of customer data terms.