[freejulian]

Lightning uses the same routing algorithm as tor — it’s an onion router. It has the added benefit of no one in the network knowing where transactions are from or whom they’re to.

With regards to channel capacity — fees in lightning are proportional to the amount of the transaction. If you are sending a transaction which consumes a large amount of capacity, you pay a high fee. Note how this is a fundamental difference from onchain transactions where fees are proportional to the amount of block space used.

Lightning is more akin to an atm. You pay a fee to take out cash, but you can then transact instantly all day with nearly no fees.

[philipwhiuk]

Tor has a centralised list of exit nodes.

[Klathmon]

which doesn't apply to tor hidden services, which work fine without an exit node.