Probably the fact that the US Intelligence agencies can't spy on it.

Are you suggesting the French government wants their ministers to be spied upon by the US intelligence services?

Allegedly the major governments participate in a cooperative spying exchange dubbed Five Eyes. Since it's illegal for Country A to spy on their own citizens, they instead have Country B do it and vice-versa. Then participants exchange info in a quid-pro-quo fashion.

5 eyes - US, UK, Canada, Australia, New Zealand.

France not a member.

the us has enough influence to pressure france into it. why, we’re all friends here! wouldn’t want to “betray” a friend, now would we?

My thoughts exactly, albeit not easily extracted from my comments.

All my trust for Signal went out the window with the cryptocurrency updates.

Besides that it is likely heavily targeted by threat actors and no doubt you have people in NSO group focused on just Signal exfiltration.

Having another app will mean additional labor for nation-states and just not relying on off-the-shelf “press button to hack” software.

Quite a few reasons to be concerned. Moxie left Signal and at least one of the new board members has a US government background. The update methods allow issuing a compromised update to targeted users. And while Signal still claims that “in our model, the server knows nothing about users”, for a few years now users’ contacts lists (sweet, sweet metadata nearly as valuable as the messages) have been uploaded to servers, protected only by the notoriously vulnerable Intel SGX technology.