|>>|| No. 7077
Second-hand book websites should normally say on the description whether any pages have been annotated or defaced.
Not meaning to be contrarian, but I annotate everything I read. I don't intend to ever sell anything from my library, though, partly for that reason. It's a great learning tool, and actually it helped me overcome some of the initial anxiety of learning. For me, it turned books from lifeless, intimidating, authoritative texts to living documents that I can (and should) react to.
Annotations have also been around for as long as the written word has, and they're an extremely useful for understanding intellectual history.
That image you posted actually comes from a great article about why annotation can be so useful -- or at least, actively engaging with what you read: https://www.nybooks.com/daily/2014/12/03/weapon-for-readers/