The ImgBB image isn't showing up for me at this time, and seems like it's hit and miss.
There could be few reasons for it.
1. Trying doing a hard refresh Ctrl+Shift+R. This will clear your cache and reload everything.
2. Your internet service provider might flag the site, I don't see any reason for that though.
I just used PostImage for the first time, I really like that site.
Same here. I used it yesterday and I am not going to use others. It found it loads faster than any other image hosting site. It feels same as in your localhost.