Have you had any "donations" yet? Honestly, I think it's ridiculous to ask for free miners. Even the gpus I had that were worthless for mining got a decent sum on ebay, presumably by people with free or cheaper electricity. You should be offering a small sum for the miners OP.
Absolutely agree.
This is glorified begging behind a veil of renewable energy and environmental concern.
For all we know you live in Iceland and are selling them on ebay straight away.
You should consider giving 50% of any mining revenue back to the person who sent it to you, which would seem a fairer deal.