There's an annual 70%+ turnover of realtors bc (among other reasons) its a cutthroat industry, nobody's colluding.
Home buying today is completely different than it was 30+ years ago thanks to the internet. Very few buyers sign exclusivity contracts upfront anymore so agents are mostly working on speculation. Until an offer is signed the buyer's agent's commission is variable, and there's no guarantee that buyers wont ditch the showing agent after the tour/open-house for another with a lower commission or to avoid an agent acting as both buyer and seller's agent. Many agents standard commission is <3% bc they dont show homes (so no sunk costs), they work entirely from home writing offers and/or creating MLS listings for the sale-by-owner crowd. Many others specialize in either buying or selling and dont care about their counterparts, nvm ones from a different brokerage that likely wont be realtors long. Regardless, most agents expect buyers to find potential homes themselves via Zillow/Redfin/Realtor/etc or the brokerage's MLS portal so the claim that realtors are somehow colluding and steering buyers is comically absurd. The only claim more absurd is that this is somehow going to cause RE prices to fall by 30%.