Dear teacher, what does this word mean

[atoom]

a guy posted some pictures of some unknown people on internet without their permission.
when his friends didnt agree to him doing that, he excused that:"i think they would accept coz they have posted all these pics on public sites"

i want to know what is this word coz short for? course, right?
if so,what does it mean here? thanks
all the best
atoom

[Tomasz Klimkiewicz]

coz = because, I would say. Makes sense?

[Casiopea]

Agreed. It's also spelled, 'cos.

[atoom]

Mr.Klimkiewicz and Mr.Casiopea

Thank you very much~~~

PS:I originally thought coz is short for cousin or course in this contexts.

[Tdol]

It's also spelled 'cuz'.

[Casiopea]

It's a conjunction. Consider,

Question: Why did I think they would accept?
Answer: Coz (because) they have posted all these pics on public sites.