What makes the comparison to Pets.com for you appropriate here?
Pets.com was insanity. It IPOed 15 months after it was founded and had no fundamentals of any kind. Snap is 6 years old and has hundreds of millions of retained users.
From the wikipedia page for Pets.com:
Despite its success in building brand recognition, it was uncertain whether a substantial market niche existed for Pets.com.[5] No independent market research preceded the launch of Pets.com.[5] During its first fiscal year (February to September 1999) Pets.com earned revenues of $619,000, yet spent $11.8 million on advertising.[5] Pets.com lacked a workable business plan and lost money on nearly every sale because, even before the cost of advertising, it was selling merchandise for approximately one-third the price it paid to obtain the products.[5]