I get suggestions for my reading from that nice Mr Bezos under his Kindle Unlimited scheme.
He’s never recommended anything I like, which is curious given how much he must know about my reading and other habits.
I followed a link about a book the title of which intrigued me, but I immediately knew it wasn’t for me when I read “No.1 Bestseller and TikTok Sensation”.
I find the same with Amazon emails. Quite often they recommend what I have just bought. If this is the future of AI we could be in for “interesting” times. 
Exactly the same for me with Amazon/Kindle recommendations. There’s no real way “they” can know what I’ll like based on either what I’ve bought before (which could have been dreadful) or what other people buy.
Same here. It’s as if they’ve not thought to check my order history as well as my search history 
I agree that books are highly subjective… Plus I often buy books for other people. My last 3 book purchases on Amazon were:
)At the risk of derailing the thread, however, there’s an interesting article going back over 20 years ago now about how similar we are in other areas of life, and how the US department store Target knew a teenage girl was pregnant even before her father did…
I have just ordered a fascinating book called ghosts of Gondwana which I saw and coveted in NZ but it weighs almost 2kg so I couldn’t put it in my luggage.
I find Kindle Unlimited generally recommends “more of the same” i.e. if I have just read a military history book it will recommend others like it.
Moderately useful in most cases, but not if I want to have my horizons expanded. 
It does sometimes suggest books I have already bought or borrowed.
More annoying I find is the way Amazon miscategorizes books - thus it often puts historical novels in amongst non-fiction history books.
That may be the authors or publishers adding the item to the wrong category of course, but Amazon doesn’t seem to do much QC on it.
Similarly Amazon is not very accurate with filters for search results - if I search for (say) a camera lens in Fuji mount, it will suggest Canon or Nikon mount lenses as well.
It’s not alone with that. Most searches tend to give you things they think you ought to want rather than what you (specifically!!!) asked for…
The biggest turn-offs for me are glowing reviews from the Mail or Express splurged across the dust jacket.
You didn’t buy Liz the Lettuce’s book by accident did you? 
No, but I did sneak a look at my Brexit-supporting brother-in-law’s copy last time I was in the UK. For its writing style and political insights, it wasn’t a patch on Enid Blyton…
Five go Crashing The Economy?