I have noticed a recurring theme with YC companies. Many of them....let's just say that they weren't selected for the strength of their technical implementation or people skills. A good example of this is Magic. This is a site that few people probably remember, but they raised $12M at a $40M valuation after 2 weeks in existence back in March. More than 7 months after raising this money, the company, whose entire business model is dependent upon people sending them SMS messages detailing the things that they need or want, has yet to place a tappable SMS link on its home page.
The simple fact of the matter is that money from VCs and/or an endorsement by YC speaks only to the potential of the idea and the pedigree of at least one founder. Nothing else seems to even be considered, even when writing eight figure checks. Given this situation, no one should be surprised that YC companies sometimes go off the rails like this.