Let's Encrypt bans its usage to countries sanctioned by the USA to conform to the U.S. law. That's added page 3.

You are not a person or entity that is:
(a) located in, organized under the laws of, or ordinarily resident in any country or territory that is the target of comprehensive U.S. sanctions;
(b) a prohibited or restricted party under U.S. or other applicable sanctions and export control laws and regulations; or
(c) owned or controlled by or acting on behalf of anyone described in (a) or (b). You agree to use Let’s Encrypt Certificates and any services provided by or on behalf of ISRG in compliance with applicable U.S. export control and sanctions laws and regulations.

It's ironic and someone pointed it out: "Let's Encrypt’s mission is to create a more secure and privacy-respecting web, except for people residing in countries with the most need for a more secure and privacy-respecting web. Sure, that's great."

We need an European alternative. Search on web directories related to EU alternatives and you get https://european-alternatives.eu/alternative-to/lets-encrypt

That's why some are already migrating away https://souverain.ovh/certificat-ssl-souverainete-numerique-actalis/