Making items freely available but with a request that consumers or users make a BTC payment if they wish

It's easy to imagine making various kinds of item available for free, but with a request that consumers or users make a payment in Bitcoin if they have got some and if they wish to.

I could envisage this being done with toys, postcards, etc., homemade or otherwise. You could call it a kind of shareware.

My question is whether this has actually been tried yet and, if so, then where and when?

Note: before phrasing this question, I read the help file and learnt that it's OK to ask here about "technologies or events that are applicable and relevant to the Bitcoin network and users of the Bitcoin currency in the past, present, or future". So I hope this is considered on-topic.



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