Personally strikes me as odd. I don't like starting out part way into a series. I accidentally did that with the Earthsea series, because I had got a copy of Tehanu. Been almost 30 years, and it still bums me out. If the freebie is the first book, I'll check it out, but if I have to pay for the first book, I'll skip the series entirely unless I had already planned on buying the first book before finding out about the sequel being free.
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