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EbookNovice, if you only read (or mostly read) Public Domain (PD) books or indies, then, yes, you might get erroneous information. Not because someone CHANGED the ebook, but because the information is out of date or was wrong to begin with.
You used an example of a weightlifting book by Arnold Schwarzenegger (too lazy to look up correct spelling). If someone used advice from him they might be in trouble if they didn't also look up more recent developments and thinking in bodybuilding and/or weightligting. Almost all fields have advancements and developments, and what worked years ago might no longer be true. Or was never true to begin with, but was the accepted practice.
Indie books do not have the same level (if any)of fact-checking that published books have, so you wouldn't be sure of accuracy unless you cross-referenced the information yourself, and not necessarily with any websites suggested in the book itself. It would be just as easy for an indie author(s) to print an erroneous book as to put it out in ebook format.
If you ever doubt the validity of any information in any book (in any format), then do due diligence and CHECK the facts. This goes for BPH books as well as indie and PD.
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