Years ago(in CS degree before professional work), I used to wonder & be amazed by how fast new companies(mainly U.S.) moved so quickly.
It wasn't because they had some secret sauce or 10x devs, it was because all they did was focus solely on features & take shortcuts. Their customers data security was an afterthought - e.g. production DBs open to anyone in company(even the world in some cases(mongo)), no auditing or logging of data access.
Maybe YC(& other accelerators) will make a security expert available to these people...because young adults with 0 professional experience will probably not consider security & rely on the defaults of whatever stack they're using to be good enough. Even less consideration will be given when they're fed & surrounded by a grow fast at all costs mentality.
Good security in their products needs thought & critical analysis put into it & I'm not sure new devs appreciate it.