Actually, in the Satstralia coordinator we move up to 5M sats with no issues but, for sure, in order to receive it in LN you want to have a good inbound liquidity
If somebody posts a trade offer to buy 1M sats but their node can't receive > 50k sat transactions, can the trade be settled with multiple transactions, in this case 20? It would suck, but just wondering if the trade could at least be settled