This write-up articulates the issues from the perspective of a security lecturer. The core issue really is ownership of technology.

https://techrights.org/o/2021/11/29/teaching-cybersecurity/

Whatever the appearance of competition between, say, Apple and Facebook, Big-Tech companies collude to maintain interlocking systems of controls that enforce each others shared values including sabotage of interoperability, security and inviting regulation upon themselves to better keep down smaller competitors. Big-Tech comes with its own value system that it imposes on our culture.