I do believe substrates can crack without user intervention. It's quite possible the flaw was created in the production process. It must be extremely annoying to a careful user who has suffered this misfortune to be told that they must have caused it.
I also doubt that Kobo is any more prone to this issue than any other reader, though its possible. There are no stats. It's all anecdotal. So who knows? I own two Kobos (both used) and I haven't suffered any problems.
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