Nhentai seems to be completely dead on my end which is basically like 90% of any hentai available on the app. It was pretty spontaneous too. I was able to go on it for a while but it just went kaput and stopped loading about a few days ago. I can't even switch back to it anymore.
There is a cloudflare captcha: https://support.cloudflare.com/hc/en-us/articles/203366080-Why-do-I-see-a-captcha-or-challenge-page-Attention-Required-trying-to-visit-a-site-protected-by-Cloudflare-as-a-site-visitor-
I hope it's temporary.
Otaku android developer
B+ Manga Reader