How do you communicate from outside the US with someone inside the US without involving any US companies?
No Internet (nevermind facebook/twitter/email/etc) because US companies will certainly control at least some of the nodes in your path and probably the DNS.
User A posts on Twitter that they are crowdfunding an idea or project. Users X which may be one, two, or thousands are willing to support and pay for that. Same could have occurred on FB, WhatsApp, Discord or anything, none of those apps are facilitating the exchange.
Because OP said:
> an international group that doesn't trust US based corporations with their personal data
That is not realistically possible in today's world, and is an issue way broader than crypto.
https://developer.twitter.com/en/docs/twitter-for-websites/p...
> What information does Twitter collect through Twitter for Websites and how is that information used? When you view Twitter content or Twitter products integrated into other websites using Twitter for Websites, Twitter may receive information including the web page you visited, your IP address, browser type, operating system, and cookie information. This information helps us to improve our products and services, including personalized suggestions and personalized ads.
The OP is probably talking about personal data such as mass collection of users photo ID, passport, email address, home address, full legal name and gender, telephone number, date of birth. In a standard non-blockchain crowdfund, these are the sort of things each donor would need to first share with PayPal Holdings Inc. - or a similar company - in order to have their donation fulfilled.
The point is that in such an unrealistic hypothetical, crypto is a very small concern.
there are many users who would be happy to have systems of value transfer that don’t require routing all value and personal data through a central US company.