The EU is not able to force Threema to anything! There is no legal way for that!
"What is crystal clear, however, is that there will never be a Threema version that’s spying on its users in any way, shape, or form. The reason Threema was created is to provide a highly secure, completely private, and anonymous means of communication. " https://threema.ch/en/blog/posts/stop-chat-control
You think a company can break EU law without consequences?
"What is crystal clear, however, is that there will never be a Threema version that’s spying on its users in any way, shape, or form. The reason Threema was created is to provide a highly secure, completely private, and anonymous means of communication." Threema
Sure, and I hope that's the case. Nevertheless, it remains the case that the company cannot offer its services with impunity in the EU after the law has been passed.