People disagree on this. Warren Buffet for example famously argues that SBC is a real expense even if non-cash, just like depreciation.
More to the OPs point, I'm guessing Uber had FB-style RSUs that don't settle until an IPO or Change of Control. I'm not sure how this all gets accounted for, but given the recent IPO, it sounds like they booked a very large SBC charge this quarter to account for the immediate hit of all the previously issued RSUs finally being settled.
Going forward, the number of RSUs that settle each quarter would therefore presumably not be nearly as large.
But I'm not an accountant so the above may be wrong.