So this basically reans if you want to target a larger audience or the public, or have any kind of asynchronous messaging, the hosting cost isnt zero as you promise

I have a couple of questions:

1. Could you not use animated graphics?
2. If this is completely p2p, does it work for people behind a NAT or without IPv4 or IPv6, respectively?
3. How does asynchronous communication work? Consider the following: My phone is offline, I send a message. Later I connect to the internet, but the recipient is offline. I go offline again, then the recipient comes online. With traditional messaging systems, this has always been working.
4. Would DWAs that target a broader audience be possible? It seems to me like this is only good for instant messaging. Can I build a video hoster, a social media platform, a lemmy or mastodon alternative as a DWA? If so: How does that work?