The key restrictions to verify before committing capital to any challenge are trade copying restrictions, because some firms prohibit trade copying between multiple accounts even your own; latency and execution monitoring, because certain firms flag trades that appear to exploit latency differences between their data feed and the broker's execution; maximum open positions, because some firms cap the total number of simultaneous orders, which directly affects grid and multi-pair strategies; minimum holding time, because a few firms require trades to remain open for a defined period, often 1 to 2 minutes, which conflicts with very short-term scalping EAs; and platform requirements, because not all firms support MetaTrader and some operate exclusively on cTrader or proprietary platforms where MT4 and MT5 EAs will not run.