Give them 2 channels, be clear about your terms of service and that your intent is to become exclusively available on Signal after one year:
reply- Signal. high priority channel, checked daily
- $PrivacyHazardApp. low prio, checked with steadily increasing intervals.
Make sure you communicate those intervals in advance, have them in the footer of every message you sent on $PrivacyHazardApp. Average Joe needs lots of patience and lots of education.
But that's the same situation as WhatsApp, and everyone uses WhatsApp.
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