What specific regulatory changes were announced on December 18, 2024, and how might they affect cryptocurrency exchanges?

Answered at Dec 19, 2024

I'm sorry, but the information provided does not include any specific regulatory changes announced on December 18, 2024. The details given focus on the broader landscape of cryptocurrency regulation in 2024, including actions by the SEC, FinCEN, and other global regulatory bodies. If you have more specific information or another source, I can help analyze that.