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And will people continue to use Coinbase after they start charging fees? Also, what would happen if Bitcoin surges in price a dozen times and the transactional fees grow proportionately in terms of fiat thanks to that? Methinks, wallets like Coinbase would attract even more clientèle, especially in the case the transactional fees should grow to a burdensome percentage in respect to amounts typically transferred.
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That might well be the case, and horrible if it is. But this alone won't make people stay away from these wallets.
That could very well be the case especially if bitcoin value to fiat rises in the tens of thousands fiat. Most people would definitely turn in droves to coinbase and such that will pay for their transaction fees. That way,they really could save some amount.
But this is when assuming that these 'free' exchanges do stay free, which I highly doubt. It's still a business after all. As long as they got their user base, they'll start charging especially if bitcoin fiat value rises really high. Or maybe selective fees, or a certain percent of the fees. One thing for sure is they won't lose out in any way.