I don't think it's harder, there's just less incentive to do so. I was shocked when I realized that dropbox was the first and only yc company to go public. Now

I don't think it's harder, there's just less incentive to do so. I was shocked when I realized that dropbox was the first and only yc company to go public. Now it's only the giant tech companies that want big liquidity events who'll go public. You almost never see tech startups younger than a decade old go public.