this has more weight: threema is the biggest "alternative" (after whatsapp and telegram) chat app among my peers. There's a sizable non-tech but pro-privacy part of the population that exclusively uses threema. This will be the first time they ever hear of this.
part is in their 50s, tech illiterate by privacy-focused. Other part are colleagues (30s-40s) who are privacy focused. This is Europe (Germany) though - the landscape here is absolutely dominated by whatsapp by a huge margin.