Sui vs Solana vs lightning network as a payment network

What is the cost of sending 1 USD of a stable asset to my friend (ptop) on a network when 500M users are using it?

Solana
current Daily Active Users: ~250k (solscan or artemis)
current cost: 0.0000085 SOL * 20 USD/SOL = 0.00017 USD (solscan)
cost for 500M DAUs:

Sui
current DAU: ~ 100k (suivision or artemis)
current cost: 0.0025 SUI * 0.50 USD/SUI = 0.00124 USD (suiscan Avg gas fee)
cost for 500M DAUs:

Lightning network 1ml
current Daily Active Users: not available
current cost: 0.04 USD (Google Bard)
cost for 500M DAUs:

Note that the question asks “when 500M users”. It doesn’t really matter what a network can do when there are 100k active users.
Do we have simulated data to compare the networks for 500M DAUs?

Notes:
Sui:
At 500M DAUs, a ptop transfer of a coin (a single-writer object) will still be able to skip consensus. But what does this mean for the fee? Is the average gas fee of a transfer for a simple ptop transfer expected to stay more or less the same over time?

Solana:

Lightning:

Feel free to chime in, suggest better resources or correct me where I’m wrong. I’ll update the post where required.

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