Threads is for whoever Meta can sell it to, and I think it was pretty far along in its development before they actually committed to ActivityPub support.
Having used a butane iron before, I don't think it would. They don't have the temperature control modern digital irons can, and they're forbidden on flights.
Signal and WhatsApp work with the free messaging option. I was a little surprised by Signal.
I'm inclined to agree, and said so in the linked thread.
Basically, anyone who can read your home directory could decrypt your Signal database. That's about typical of traditional desktop applications, but questionable for security-oriented software. Mac OS and (sometimes) Linux have more robust credential management options, and Signal signaled (yes, pun intended) its intent to adopt them.
That's similar to the iFixit iron, as is the less expensive Pinecil.
Those are probably the best options currently available, but I want something more compact and self-contained.
I would accept a bit of an awkward balance for being self-contained.
What I want from a battery soldering iron is a field-replaceable 18650 in the handle, not Webserial.
As a practical point, saying it in English will almost certainly communicate what you need to communicate. Almost everyone who makes international calls will recognize that you're speaking English even if they don't understand what you're saying, which suggests that the Russian or Korean speaking person they're trying to reach is not at that number.
Apps on F-Droid are not using proprietary Google APIs and won't be affected.
The whole tech world saw Microsoft Palladium as a nightmare scenario, but was quiet ten years later when Apple and Google did the same thing to our phones. That was a mistake.
The fact that it's been out for a year and federation is still only half-implemented suggests to me the decision to add it was pretty late in the development process, even if it was early in the marketing process.