it's not "most" brokers, it's all brokers due to a law called PDTQuote from mildguacamole:
I'm young as well and would like to get in to day trading myself. I've been trading with marketwatch for 2 years with a virtual $100,000. Don't I need $25k to day trade with most online brokers?
nowadays, most people with less than 25k just open an account at 3 different firms, I think that gives you 9 trades a week