Relays: explain main use cases and per-protocol limits #387
Description
Ref. https://docs.libp2p.io/concepts/nat/circuit-relay/
The page should mention that
- relays are limited by default (time/bytes)
- relays only allow specific libp2p protocols to be relays (e.g. ping, identify, hole punching ones)
- relays do not allow protocols like bitswap by default
- one can run own relay with different rules
- lift bandwidth / time limits for specific IPs
- allow extra protocols
- NOTE: there should be warning this is a potential cost center and implementers should be very careful / have logic ensuring only their "blessed" clients use their "unlimited" relays