Earlier quoted context omitted.
What you're talking about is not frontrunning, it's purchasing order flow for market making. Frontrunning is an illegal activity with a specific definition. Purchasing order flow is not illegal. While we're at it, quant firms occupy a family of trading strategies which are a superset of HFT; not all quants are market making, trading intraday or pursuing low latency strategies. With all due respect, please stop perpet…
So what if one of those non-market making firms buys order flow?
You can quibble with the academic arguments on whether or not this facilitates liquidity and price discovery (and therefore helps retail investors). Or you can just place a limit order and move on. Either way, nothing illegal or nefarious is happening. Just because they're purchasing order flow and executing your trade doesn't mean the national best bid and offer (NBBO) is being violated.