How do you feel about changing unpaid commishes?

UPDATE: I decided to just upload the thing as a DtC since people are confused about my intentions in this journal. I'm keeping the journal up though because of comment reasons.

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So I was thinking of taking unfinished/unpaid commissions and converting them into something useful to cut my losses. By letting people donate the original commission price to see it get completed. How do you all feel about something like this happening?

I modify the pic to not be the original commission (usually character replacement) and then ask people to donate to get it finished.