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Probably the same reason as with other libraries from the academia. When all free licenses are pretty much equivalent from your point of view, choosing a license is just a bureaucratic formality. The person choosing the license usually doesn't think about the issue too much, and they probably don't have that much experience with licenses anyway.
The currently active fork of SDSL (https://github.com/xxsds/sdsl-lite) has a BSD license. There was supposed to be a team developing the fork, but most people either left the academia or had their research interests move elsewhere. Now there seems to be just a single developer who maintains SDSL as a byproduct of SeqAn.