I have done at home prescreener tasks, as long as they were sub one hour, clearly academic, and patently not related to the business. These are not paid. I have

I have done at home prescreener tasks, as long as they were sub one hour, clearly academic, and patently not related to the business. These are not paid. I have also done on-site dev tasks and tests which were squarely related to the core business, and have invoiced my day rate each time, which was paid. If a company asks for more than an hour, for tasks related to their business, and don't want to pay, run, don't walk away, and better still, spread the word so people become aware and avoid them in the future.