The UK is just the first to make this requirement, other greedy companies will follow.
This is an interesting topic. However, I am inclined to disagree with this statement.
Public performance is a reserved right that applies to each jurisdiction in which a broadcast is to be made available to the public -- hence the term "public performance." In other words, the location of the streaming server is trivial; the location of the streaming receiver
By tradition, ASCAP and BMI Webcaster licensing extends only to the territorial United States because these are U.S.-based performance rights organizations. Thus, one cannot legally transmit music into the United Kingdom with only an ASCAP and BMI license. Likewise, SoundExchange does not have the legal authority to execute licensing for the digital transmission of sound-recordings outside of the United States. (While the IFPI has produced an international Webcaster agreement for this purpose, SoundExchange is still not yet a signatory.)
Public Performance Limited are enforcing a legal precedent that has long existed in intellectual property law. In comparison to SoundExhange, PPL are what a performance rights organization should be about -- protecting and enforcing the rights of its members.
If you have further licensing questions, I would advise speaking with an attorney for qualified legal advice.