Because they need to comply with laws in many nations.
How to use the ® and TM Symbol
11 Mar 2012
Can I legally use the TM symbol before I apply for a trademark registration? Yes. But not the ® (circle r) symbol. Learn to use trademark symbols properly.
Does the font matter for the ® registered trademark symbol?
10 Mar 2012
Select a font that allows the registered trademark symbol to be readable and legible. Most modern fonts include the registered trademark symbol, so you should not need to change fonts for the symbol.
