Yeah, I wouldn’t expect any finance-related website to load without JS. Some of it is necessary for security and generation of cards I assume. However, it would be nice if the front page before login didn’t require JS. 
i also assume it doesn’t load with TOR-browser … does it ?
Why wouldn’t it? I haven’t tried. Frankly, whenever I want to visit a .onion site or want a little extra anonimity I use a Brave Private window. 
If anything, you can think of it as a trade off. Either way, you have to fund it so they very likely have some idea of who you are. But, that’s one point versus nearly every other you purchase from.
i mentioned it because i know for a FACT that TOR is just a firefox unicorn that disables some scripts on web-sites with the other p2p stuff … so yeah if disabling JS is unwelcome then TOR most certainly will make it impossible to load (unless you enable it).