Hola Kwiziq team
I can't find any on-line Spanish grammar text that indicates that "que" can be used in place of "porque" to begin an explanatory clause. I assume that that usage must be very colloquial and only used when talking with friends. Am I correct about that?
Yes, this use of que to express a cause is more colloquial so it may be more difficult to find examples. You can see here in RAE entry number 7, giving this meaning to "que".
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