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The fact that people make money off of HFT by definition means that the market conditions have changed in those time frames.

No, it is proof that they are parasitically extracting money via non-productive strategies like latency arbitrage and order front-running.

Which is changing market conditions.

Liquidity provision is valuable though, and it's not really parasitic to exploit inefficiencies, it's not even that profitable a strategy today.

It isn't nearly valuable enough to compensate for the wealth HFT extracts from the market.

your information seems to be at least a decade out of date