2M units globally, so maybe generously 1M in the US (assuming you're from there but multiply by some factor proportional to your country's consumeristic tendencies), divided by the population is only something like a .3% rate of ownership. So not quite as prevalent as gopro, which has sold something like 35M in the US over the past 10 years [1]

[1] https://www.statista.com/statistics/688306/number-of-gopro-u...