Forgot about that! Thanks for telling!
They might also offer additional services against pay.
But this will not happen in the near future to any notable extent, because there's too much competition in the marketplace. Currently every wallet provider tries to get as many users as possible, postponing profitability considerations.
ya.ya.yo!
Coinbase charges 0.0002BTC/tx , so they charge 0.1mBTC as fee per tx per address but a lot of people use it.
~~MZ~~
Ok, then I was wrong and it's already happening.
As long as the fee is small, it doesn't seem to bother people...
ya.ya.yo!