That's one of the downsides vs trading personally: I'm playing with Sierra Chart right now for historical simulations (others like Ninja are just too resource-hungry for my taste). When I'll switch from historical to real-time, by monthly bill will come up to about $65/month for all the futures and stock exchanges I'm interested in, combined with SC's license fee itself. This is because the CME has a drastically reduced data fee if you have a brokerage account, and SC can connect to my Interactive Brokers account once a month to confirm mine.
All this to say, for a small account, if I trade on my own my monthly data/platform fees are about $65 but if I happened to want 4 exchanges at TopStep, they go up to it seems $365 because since their backer is a professional trader, by association each funded trader is as well. Someone with $400/month to invest in combines and then data fees can probably afford to trade the same handful of lots on their own...
I guess the only single advantage remaining at TopStep now is the black swan protection. It's the main reason I can't convince myself to write them off.
This is a very good assessment. I keep scratching my head trying to figure out why the fascination with Topstep. If you really have an edge, trading futures will easily build up your account. With many brokers allowing for trading futures with even less than 1k per contract, I would imagine that within a week you could double this, and then double this again, thereby allowing even a trader with only a few thousand to play with be able to get into the game. (I'm of course not suggesting you can always double to infinity, but trading 1 contract, then 2, and then 4 with a method that is profitable for at least a few points a day for 4 out of 5 days lets say is certainly within reason).
As for the black swan protection, I really don't think this is a huge issue if you religiously use stops. Perhaps something can happen at 4:15 when the market closes, or between the Friday to Sunday close, but most day traders wouldn't hold a position after hours. And if your funds are limited, then you probably don't even have the initial margin to hold outside the RTH anyway. If lets say some drastic event happens during RTH, slippage might be a few ticks, maybe even a few points, but getting out of a few contracts shouldn't be impossible.
About the only scenario I can come up with is an attack on the CME that shuts it down without warning. You might have your stop in place, but because of an instant outage, you're still in your trade. Then when the market opens, the gap might be huge, and your stop could of course have a fill hundreds of points away, thereby making your small account extremely negative. But this would incredibly rare, and I'm not sure what sort of backup systems the CME would have to prevent such a thing, but perhaps there are backup systems in place that if a main server goes down in one building, trading can continue at another location.
Of course the psychological relief of knowing you can't lose your own 10K might be of help if you're trading for Topstep, but if this is an issue for you, then you perhaps would never be in a position to pass a combine anyway.