Sorry, I didn't think in terms of degrees of untrustworthiness.
What I miss is an open-source alternative. Doesn't Microsoft
let the NSA tap into Skype calls?
Yes, but it seems like Skype was doing that prior to being acquired (though Microsoft seems to have accelerated things). From some quick Googling to refresh on PRISM –
>• In July last year, nine months after Microsoft bought Skype, the NSA boasted that a new capability had tripled the amount of Skype video calls being collected through Prism;
>• Microsoft helped the NSA to circumvent its encryption to address concerns that the agency would be unable to intercept web chats on the new Outlook.com portal;
>Eight months before being bought by Microsoft, Skype joined the Prism program in February 2011.
> According to the NSA documents, work had begun on smoothly integrating Skype into Prism in November 2010, but it was not until 4 February 2011 that the company was served with a directive to comply signed by the attorney general.
https://www.theguardian.com/world/2013/jul/11/microsoft-nsa-...
What is immensely important is to raise the cost of lying to where it becomes something investors care about. The only real thing a company and its investors are afraid of is losing its customers.
If we teach companies it is okay to lie by staying with them, they will lie more.
For instance Big Blue Button : it's not perfect, because it's Canadian, it's hosted on Microsoft's Github, and might have some outstanding security issues [1], but I would probably still trust it more than Zoom or anything GAFAM.