Their Matrix Chat post goes like this:
We have updated our Homeserver Terms and Privacy Policy. We strongly encourage you to read these documents in full, but for clarity these are some of the main changes:
- Updated the minimum age requirements for use of the Matrix.org Homeserver to be 18 years old;
- Introduced new measures to comply with our obligations under the Online Safety Act and the Digital Services Act;
- Introduced new payment terms to support paid plans on the Matrix.org Homeserver;
- Describe the new data processors to support paid plans on the Matrix.org Homeserver.
Each of the documents has a detailed version history which we encourage you to review. The updated Homeserver Terms and Privacy Policy take effect on ~~14 August~~ 7 August, 2025. These terms apply to you by continuing to use the homeserver after that date. If you have any questions please drop us an email to legal@matrix.org
Source: https://old.reddit.com/r/privacy/comments/1mdgbi4/matrix_homeserver_the_default_one_set_in_the_uk/
Couldn't find an official blog post from Matrix, if someone has one, feel free to share