Being open source by default doesn’t make a project secure and privacy friendly (especially if it’s server sided code. You can’t really verify for sure)

And that’s terrifying.

Imagine you didn’t even heard about google, but some of your colleague/friend use Google contact synching (which is very default these days) And ta da! Google knows your name and number with 99% percent of accuracy.

Wow! But mine didn’t. Which filter lists are you using?