The same way it all worked before youtube.
And how might that have been? I might be misremembering, but this was my recollection:
1. Movie studios and TV channels funded production of videos to be viewed by the public. Very few pitches got funded.
2. Movie studios promoted upcoming and newly released movies through television advertising, and TV channels promoted shows to the channel's own viewers.
3. Movies were paywalled, and TV was ad-supported (in the case of broadcast) or behind the combination of ads and a paywall (in the case of cable).
Also, before YouTube, most end-user devices on the Internet had an IP address, even if dynamic, which could accept incoming connections. Nowadays, a lot of Internet subscribers' devices are behind network address translation (NAT), and if you share your IP address with the whole neighborhood, the ISP is unlikely to forward a port to your device.