I don't think that anyone has noticed but a few days ago I updated the original post. I have added new questions and divided them into 5 sections and I also updated all of the answers. 2020 version is available
here for comparison. I would appreciate any feedback.
You removed some questions such as “What happens if some nodes go temporarily offline?” or “What discourages from running big nodes and overtaking the network?”. Would you mind explaining us what made you do so?
I have a question about this:
How much money can you make on running a Lightning Network node?
Unless you have a lot of coins, your earnings won't be enough to cover both hardware and maintenance costs.
Why should you have a lot of coins deposited in your LN node? Aren't the users supposed to deposit and be responsible for their channel's capacity? Also, what prevents someone from allowing free transactions (not even for 1 sat per tx)? Aren't lightning clients choosing the node with the lowest fee rate?