Here’s what i’ve somewhat gathered so far for countries (no guarantee on accuracy):
Smart Lock Guest Access: CA,GB,US
SmartThings Home Monitor (also restricted by hub): Global minus China
HomeCare Wizard: “CA”,“KR”,“MX”, “US”,
Smart Lighting: “CA”,“CL”,“DE”, “ES”, “GB”,“IE”, “IT”, “MX”,“SG”, “US”
SmartThings Clothing Care: AD,AL,AT,BA,BE,BG,CH,CY,CZ,DE,DK,EE,ES,FI,FR,GB,GL,GR,HR,HU,IE,IS,IT,LI,LT,LU,LV,MC,ME,MK,MT,NL,NO,PL,PT,RO,RS,SE,SI,SK,SM
SmartThings Air: KR
Smart Energy: KR, GB (Bulb)
SmartThings Find: Global Minus China and Japan