It was the support cost as far as I remember. Way too many people were too confused about how Bitcoin works.
Volatility was not the concern, at least for Valve. They’ve utilized a payment gateway that just swapped the BTC to USD right away. Which was still a single point of failure, but in case of bitcoin, the company switching a payment gateway does not affect the UX for the customer as much.
NotMyOldRedditName@lemmy.world 11 hours ago
The problem was the congested network causing unreliable transactions that would take too long which would make the price too volatile.
That led to too many refunds or failed payments or payments that were no longer sufficient.
All of those problems can be avoided today using a stable coin not on the bitcoin network.