As said before: the whole E2E, CSAM diskussion is not really the issue here. This is afaik about complying mostly to very specific takedown requests (as telegram offers no legal address inside the EU) and more general platform regulations that require mechanisms to prevent illegal content. Telegram does not offer any E2E encrypted group chat and actually actively interferes in groups by pushing advertisements, so they should be able to also block illegal content.

Having said that I am no fan of installing law enforcement inside private companies. However, telegrams noncompliance with court orders is problematic particularly related to protecting human rights of 3rd parties in the digital age.