Out of curiousity, I tried to figure out the current capitalization table based on the listed values for price per share and amount raised for each round, along with a current valuation of $1B:

  round    # shares    fraction ownership
    A       14.6 M            23%
    B        8.2 M            13%
    C        8.4 M            13%
    D        8.3 M            13%
    E        6.3 M            10%
  non-VCs   16.7 M            27%