"AI systems should fall within the scope of this Regulation even when they are neither placed on the market, nor put into service, nor used in the Union."
I don't really understand the limits of it's scope e.g. the difference between making a system available vs. controlling how it's used is not clear to me. I don't think you can escape the regulation of high-risk uses by offering a "general purpose" AI with no controls on how it's used.
In terms of the open-source nature - I can see it being treated like giving away any other regulated product e.g. medication, cars, safety equipment etc. The lack of cost won't transfer the liability from the supplier to the consumer.
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:52...