Hey, @penguinpablo.
When you say that dapps can signup users easier post HF 20, you're referring to the fact that there's a means to do it, right? The dapp still has to have enough RCs to do anything, and since account claiming is the most 'expensive' transaction on STEEM, even Steemit Inc has not been creating accounts in 'floodgate' abundance, from what I can tell anyway. Numbers so far are better than they were previous, but not that much different than what they were when I signed up. Certainly not in the multiples of tens of thousands range yet, or whatever floodgate numbers would be.
Creating 'free' Steem accounts is indeed quite costly in terms of RCs. So 'free' is actualy not fully free. Accounts with large amounts of SP can freely create a couple of new accounts per day, but not in the hundreds. Maybe this will improve if people can delegate RCs to other accounts.