Likely because keeping your place in audio playback doesn't bring in as much cash as a cryptocurrency deal.
If Signal can get a decent amount of money from this crypto scam, there's a good reason to implement it over some minor usability features. Free users don't directly bring in any cash, after all.
If Signal can get a decent amount of money from this crypto scam, there's a good reason to implement it over some minor usability features. Free users don't directly bring in any cash, after all.