Just hours after Snap(chat), or rather its shareholders, were gravely injured when the stock tumbled below its IPO price, one of the company’s IPO underwriters Morgan Stanley decided to add some insult, when its analyst Brian Nowak downgraded the social network, or photo app, or whatever it is these days, to equal-weight, cutting its price target to $16 from $28 on ad product and competition concerns. Shares promptly tumbled another 2.7% to $16.50 in pre-market trading on the downgrade .

According to the MS analyst, the company’s ad products are taking longer to improve and evolve than previously expected, noting “our latest industry conversations indicate many advertisers are struggling to develop SNAP ad units with sufficient completion rates and consistent return on investment.” He also cited increasing competition from Instagram, which appears to be giving advisers sponsored lenses for free, according to checks. Nowak calls this troubling as he estimates sponsored lenses and similar products accounting for ~50% of SNAP’s ad revenue.

MS also listed 4 larger than expected challenges:

4 Larger than Expected Challenges. First, our latest industry conversations indicate many advertisers are struggling to develop SNAP ad units with sufficient completion rates and consistent return on investment. Lower ROI holds back incremental ad dollars (see Exhibit 5). Second, we believe that SNAP’s ad ROI measurability has not improved as much as we had hoped or as much as expected by agencies this year…and that it remains lower than at other platforms (like Facebook and Instagram). This also holds back advertisers’ willingness toincrease ad budgets. Third, SNAP’s self-serve automated bidding platform (which is intended to move beyond direct ad sales) is not scaling as quickly as we expected, as we initially thought the product would be fully launched in early 2017. We now do not expect it to scale until 4Q:17 or early2018. Fourth, we believe Instagram is likely to be more disruptive than previously expected as our industry conversations indicate that Instagram is giving advertisers sponsored lenses for free. This is troubling for SNAP’s forward ad growth given Instagram’s scale (450mn+ estimated daily active users, compared to SNAP’s 166mn), SNAP’s current $15+ CPMs on lenses, and the fact that we estimate sponsored lenses and similar products make up approximately 50% of SNAP’s ad revenue.