I think what they’re saying is that, to a lot of people (myself included), Signal is currently the best option despite being centralized. The decentralized options have UX issues, too small a user base, or aren’t well known enough to have gone through robust security/privacy reviews. While you can’t see what’s running on the signal servers, the app is open source and so far it looks to be encrypting the information correctly and it’s not sending anything but the minimal data to their servers.
‘A lot of eyeballs on the code’ is only relevant for open source apps. They were making a comparison between Signal and the many other open source mobile messaging apps.
You might also find this chart helpful if you’re looking for other alternatives. Personally, I found Signal to be the best one to get my friends and family onto
This is almost too interesting
Cool find, thanks for sharing!