I'd be okay with "homework" if either 1) it's truly time bounded via programmatic cutoffs or 2) it's paid.

For time bounding, I love the time estimates they give you for a decent sized problem. A major company told me that a feature extraction problem + report should only take 4 hours. They provided me with some large CSVs representing DB tables (which contained some malformed data) and wanted a brief report back.

That's unrealistic in 4 hours even for a great performer. Then you spend the weekend on it and they won't give you feedback on it because of the suits in legal.

It's disrespectful.