It’s been around for years, but the growth in IB programs has significantly increased over the last 10 to 15 years. Especially in public schools (IB programs first started in private schools). AICE is a more recent program.
https://www.dcds.edu/uploaded/Buzz/December_2014/UnitedStatesCountryProfile.pdf
However, my main point is that the College Board must see the growth of IB/AICE programs as something it wants to emulate. It’s all about the $$$.