It does not matter, the robots make trading with cheaper commissions...
Don't forget...many documentations & arcticles posted at this forum that HFT firms are losing in their trading the past recent years but they are well capitalized...most can endure the loses or merge into another firm.
Yet, if you're concerned about their advantages (e.g. commissions)...you should be more concerned about the more important advantages that HFT has over you.
The times when they're able to make money...they are doing such in global macro, index arbitrage, volatility arbitrage, long/short equity and passive market making.
In addition, they use ultra fast speed computer software and are smart enough to put their servers in the same neighborhood (within the same city) as the exchange of their high frequency trading to minimize latency delays. Seriously, how far do you live from the exchange that you're trading on ???
Many argue that if you're
not in the same city of the exchange you're planning to do HFT trading...don't bother...find something else to do.
Then there's the issue of Quantum computing...
oh boy...will financial institutions get access to it first or will the general consumer get access to it first or will it be a tie.
https://www.elitetrader.com/et/forums/automated-trading.48/
wrbtrader