I think a lot of non-techie people only know signal from the Trump admin using it illegally earlier in the year. In a lot of people’s minds because of that they think Signal = insecure because they don’t get the nuances of why using it in that specific context – on personal phones, using a third party app, with a random journalist in the mix – was bad, but that for most people it’s still one of the best options. WhatsApp on the other hand has a lot of marketing around it and if you didn’t know that Meta is Facebook I think some people wouldn’t even realise who the owners are.