What does 赚走 mean in 赚走93.3亿美元?
走 here is a result complement that indicates 'away'
Apple is an American company, the article was written from the standpoint of the Chinese market. Therefore, it used the term 赚走,  which means 'earn (and take away)' from China --  Apple is profiting from the Chinese market
If the article was written from the standpoint of the company itself, it would use 赚得 (earn and get) or 赚來 (earn and take in)
Also: 赚取 - to earn (and take); 赚回 - to earn (and get back);赚了- to earn (completed); 赚到 - to earn (succefully)