It’s ethical but is it actually going to represent you in the best possible way? If the answer is yes, then I wouldn’t stop myself. Personally I wouldn’t want to use a preset or pattern that other people have access to because I want my music to be more unique than that. I usually wipe the contents of any machine I get so I’m starting “clean.”
But there are no ethics involved in the decision, it’s really just an artistic choice. A lot of great songs have been made using preset drum loops.