Books from the MIT Press Essential Knowledge Series
abakcus.com
abakcus.com
https://www.veryshortintroductions.com/browse?btog=book&isQu...
[1] https://abakcus.com/48-beautiful-books-in-oxfords-very-short...
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"Open Access" ($7.47) https://www.amazon.com/Open-Access-Press-Essential-Knowledge...
For the same reason people on here write „Company X is better than Y for Z reasons. Disclaimer: I work for company X“
2. it creates an incentive to put these spam articles all over the place which creates noise.
3. they could have disclosed it and then it would have been at least transparent.
I.e. a financial incentive increases the incentive for the owner to create good links. No incentive means why should they care?