That's a good question. From my experience, this includes all guys whose methods where they have no information/speed advantage, so you can imagine this includes most TA, quant intraday "strategies". I work at a fund where we do allocate some money for prop trades; in the past 6years, 100% of the quants (about 15 of them over time) who tried intraday trades, stocks or futures, had failed. Only guy who's netting a profit, but under performing against actual rate of inflation, is basically running a market making program where the IT budget (needed for speed) eats up most of the profit.