[cyberpunk]

Playstation, Juniper, NetApp, Netflix to name a few small users. If you touch any of these, you use it too.

[tavavex]

I know many OSes are based on FreeBSD, I assumed that OP implied people who used the actual standard distribution of it, not highly-customized embedded or similar versions. Also, using Netflix wouldn't make one a BSD user just because it's what they run on their servers.

[flohofwoe]

Don't forget macOS and iOS, Darwin is also derived from BSD.