It is not considered a good alternative as a messaging app for privacy folks and because the source code is not open, it is not E2E encrypted by default (you need to start a secret chat or something to make your conversation encrypted) if I remember correctly.

I am using a deGoogled phone and also doing browser separation, I only use google in chromium, never for searching stuff. I was talking about getting an electric toothbrush and my wife googled a big brand to check the price (she does not care about privacy). About 10 minutes later ad blocking was not working for some reason and I starter getting toothbrush ads. I would say it knew somehow that we were in the same household and targeted us both.

I always ask if they have a curtain. Why have one, when you have nothing to hide? It blocks the view, sunlight…

I looked into this a year ago and most sites did not offer to register a second key, so if you lose your key, you can kiss many of your accesses goodbye. I would never have the key to my digital life on a keychain… The idea is good, but it will cause huge damage if you lose your HW key. On the other hand, if you are cautious and use different PWs and a password manager with 2FA, you are quite safe.

Most of us would probably just be fine with PWAs, but the marketing branch says no… They need everything possible about you, need the app to run at startup and send you notifications at least every 4 hours…