If cost of capital were constant what rate would equate to the PV of Terminal FCF that is shown in this valuation?

What is the Terminal Growth rate assumption for FCF?

What do you feel is an upside risk to the FCF valuation (price would be higher than he assumes if what assumption change in what way)?

What do you feel is a downside risks to the FCF valuation (price could be lower than he assumes if what assumption changes in what way - also, a hint that almost any answer is right for this and the prior question)?

If you used Uber's last VC funding valuation, what comparable measure most closely matches this FCF valuation?