Well here is my explanation : "Due to" can only be used to modify nouns and can interchangeably used with "Caused By".
Eg : His high GMAT score is due to relentless hard work.
Here "His high GMAT score" is a noun entity with a bunch of noun modifiers. and Due to modifies it further or gives a reason. We can use "caused by" in lieu of "Due to" and it must make sense.
Eg: His high GMAT score is caused by relentless hard work.
"Because
...
Eg : His high GMAT score is due to relentless hard work.
Here "His high GMAT score" is a noun entity with a bunch of noun modifiers. and Due to modifies it further or gives a reason. We can use "caused by" in lieu of "Due to" and it must make sense.
Eg: His high GMAT score is caused by relentless hard work.
"Because
...
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