WhatsApp might be a good model to compare against. Americans paid for it and it never really took off in the US. Rest of world had it free and it still dominate

WhatsApp might be a good model to compare against. Americans paid for it and it never really took off in the US. Rest of world had it free and it still dominates. A lot of people want to avoid WhatsApp because you're really just paying with personal information. But until there's a real barrier, it'll be around.