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by ViViDboarder 2210 days ago
One is for their private contact discovery system[1] and two because they were trying to promote Signal as a default messenger with iMessage like automatic encryption upgrading. A goal to enable people to adopt it even if all their friends weren’t converted yet.

[1] https://www.signal.org/blog/private-contact-discovery/

Of course, this feature is Android only as iOS doesn’t allow default alternatives.