Below is the official announcement of Xiaomi to suspend themes Apps and mi messages service temporarily in some markets.
Due to changes in regulations in some countries, we are temporarily suspending the online theme store and Mi Message services in some markets.
Xiaomi takes user privacy very seriously and will comply with all regulations regarding privacy. We hope to bring these services back online once modifications have been made to allow us to comply with changes in regulations. The countries affected are: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swede, and United Kingdom.
When users in these countries update to the next version of MIUI (developer ROM for Mi 6, Mi Max, Redmi Note 2 on Feb 24, developer ROM for all other models on Mar 2; stable ROM for all models upon next update), the Themes app will no longer be available, and users will also not be able to use the Themes web page to download themes onto their devices. Themes and wallpapers that are already stored on users’ phones are not affected and can continue to be used. All default themes, notification sounds and wallpapers are also unaffected. At the same time, the Mi Message service will also be disabled.
MIUI has always aimed to provide a great user experience and customizability. We are working hard to update and improve the theme store and hope to bring back a new and even better version in the near future.
Source: ( Xiaomibuying and MIUI Forum https://goo.gl/QEG1X1 )