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Tightening the spread reduces everyone's transaction costs. Successful algo trading takes money away from existing market making traders and splits that money with those who need to trade for reasons of capital allocation, financing and hedging. It's straight up price comeptitive under cutting in the most darwinian way possible. Less money sticks to the financial system, more money in the hands of business to expand and build stuff. More money in your retirement savings.

I think that's doing something.

ive had this convo before- i dont think your wrong for bringing this up, but i think in almost all cases, the diminishing returns of “more liquidity” were hit well before this point. i dont think it matters to tighten the market ever so slightly

Doing things doesn't really earn money these days. Perhaps someone is better off playing the game to earn money and then doing something positive for no money.

there are plenty of ways to make money doing things. playing the game and then doing something positive is also a legitimate option, so long as the game has no negative externalities (and it often does).

Yes, but I certainly wouldn't mind supplementing it with some passive income from a little automated trading.

fair enough

petting your trading bots is doing something