No, you misunderstand. You’re thinking of DHCP. The parent poster is talking about CGNAT, where hundreds or thousands of customers of an ISP may share the same public-facing IPv4 address. It’s impossible to self-host anything in this scenario, there no way around it and DDNS won’t help you.
Youtube Anti-AntiAdblocker uBlock Origin Filter
To get rid of the annoying YouTube message (ad blocker are not allowed on Youtube) use this custom filter in uBlock extension...