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.
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.