A couple things I learned and then some of my own thoughts as to why Snap stinks.
25% of all stock issued at IPO was promised to be held for one year. Snap and the underwriters - Morgan Stanley and Goldman Sachs - were able to convince individuals/institutions to agree to buy the stock and hold onto it for at least one year. It's very rare that companies are able to accomplish this and those companies are actually turning a revenue. These shares that are held for a year are going to help legitimize the company, which is useful since they lost $514.6 million dollars last year.