Releasing unaccepted work

I have answered to an online job post asking for data to be scraped from a website. I wrote a script for that and use it to collect a sample as proof that I had done what was asked in the job request.

I am contemplating releasing the code, it's nothing special but it is something I worked on and may be useful for others.

I'd like to know what others think about open sourcing code like this.

Is it ethical or not? What implications do you see? Would you do it? Under what circumstances? Would you be ok if a potencial contractor released work you asked for?