"Some papers do not render correctly, for example figures and tables in mine [1][2]. Beside that, some articles may not be posted under a permissive license, so you want to double check that you're not running into copyright violation troubles by modifying or publishing them.
[1] https://... [2] https://..."
Sounds a lot more positive and might get better results than being as adversarial and negative (imo) as the original comment?