They don't decide the route, they can decide only the first hop. Some of them could have some zero fee channels with other peers and that's why you could have a less fee, but that you don't know for sure, maybe tomorrow you will do again the same test and you will have totally reverse results, because the payment took another route. It's all about in THAT moment of the payment, how available are the routes. In LN there's no such thing as always a FIX fee.
Because of onion routing, doesn't the sender decide every hop?
The sender has to encrypt the payload with the public key of every node in the route
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Again, depends on his peers routes. A router could not decide manually exactly the route. The protocol decide.
Here is a very good presentation by Rene Pickhardt talking about path finding
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Good idea, I will try again later and report
I could see this as alarming / annoying for new users. Another UE issue we need to overcome to reach more ppl
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Why is alarming? Is normal. Fees on LN will always be variable. Don't make too much case for that.
And read my guides. I did a lot of testing in all these 10 years with Bitcoin and all these tests became guides. For example this one: https://darthcoin.substack.com/p/private-lightning-nodes https://darthcoin.substack.com/p/managing-lightning-node-liquidity
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