Ultimately the issue is that IPv4 addresses are expensive. Allowing multiple users bind to port 80 on different IP addresses, assume you can have multiple IP ad

Ultimately the issue is that IPv4 addresses are expensive. Allowing multiple users bind to port 80 on different IP addresses, assume you can have multiple IP addresses on that IP. Unless they are private IPs, that's going to be the main issue. Any practical solution would need a system wide nginx to proxy to all of the tenants, who would run their apache/nginx/node etc. on a high numbered port.