200M to 1B sats in node size is probably the minimum why, Enough channels for your 100+users to have enough liquidity to utilize from. Anything short of that and you most likely won’t have enough sats from forwarding fees to cover your expenses. Users are what generate sats for your node, I’m talking mobile wallets with private channels or lndhub/lnbits wallets. Perhaps in the future more users will benefit routing node operators more.

Anyways stay safe gl hf don’t get scammed.