Are there any alternatives to the Internet Archive that are built around P2P, so that everyone can contribute to hosting/sharing web archives?
Seems like having all these important archives hosted by a single organization isn't the best idea for longevity/redundancy
Imo that's why internet archive torrents exist. What you really care about you can seed. I do the same.
Maybe the OP meant the wayback machine?
No, closest thing is to join a datahoarder group and trade when needed.
Although with LinkWarden gaining popularity, something like this developing is a possibility.
I2FS?