The tweet he was replying to said: "I've heard various reports from people I trust that Signal is compromised. Any comments/thoughts/reliable rumors?"
With his reply, Durov is implicitly claiming that Signal must be compromised because it received some funding that can be traced back to the US government. This is the same kind of FUD that has often been used to smear Tor in the past (and indeed, the piece he cites describes Tor as "a federal weapons contractor" and "a foreign policy weapon, a soft power cyber weapon").
With his reply, Durov is implicitly claiming that Signal must be compromised because it received some funding that can be traced back to the US government. This is the same kind of FUD that has often been used to smear Tor in the past (and indeed, the piece he cites describes Tor as "a federal weapons contractor" and "a foreign policy weapon, a soft power cyber weapon").