I think the alternative is to recreate the internet with more p2p friendly infrastructure. BitTorrent does not have this same DDoS problem. Mesh networks are designed with sybil resistance in mind
No, it really isn't. Unless you mean like on the BGP level. But it's p2p in the sense where you have to trust every party not to break the system. It's like email or mastodon, it doesn't solve the fundamental sybil problem at hand.
>BitTorrent is just as susceptible to this,
In bittorrent things are hosted by adhoc users are that are roughly proportional to the number of downloaders. It is not unimaginable that you could staple a reputation system on top of it like PTs already do.