All of:

1) assembling a usefully-large initial dataset to gain traction,

2) keeping it updated, and

3) content moderation & anti-spam

Seem super dull and tedious for project that's probably going to fail, and there's little about the rest of the process of building an improved Goodreads clone to offset that and make it enticing to work on. I'd say the only folks likely to try would be those who already have & maintain at least a partial dataset of books for other reasons, and/or existing name-recognition and a community around books and reading.