Those that don't commit a crime don't have to worry about being turned over to the government. Who is thinking about that anyways? I've no problem or worry using any message app.imessage is probably the most used platform, maybe save for some platforms used within China. It’s the most reliable, no installation required and ios users don't have to barter with other iOS users as to what competing platform to use.
iMessage is also secure as one doesn’t have to worry about where the encryption keys are and will they be turned over to government.
But enjoy your messaging platform, there’s room enough aplenty for all of them.
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I use Hangouts and quite often. Only thing I don't like about it is you cant delete single messages. You have to delete the whole conversation history with that person and start another. Which can be ok but I like to keep past texts with them for the posted pics we shared.Plenty people in America use Hangouts. I personally don't because the earlier versions turned me off, and was never tempted to try it again.
Google Voice, I and many others in America use it for multi platform Visual Voicemail. IMO, it's the best voicemail service and completely free. I also use Google Voice if I'm selling or buying something on Craigslist or the Letgo app. Works great as a secondary number for calling and texting.