For videos, I used a variety of video hosting sites but only YouTube and LBRY work well.
Namely BitTube would be a great addition if universal support for embeds is not as easy saud as done.
I always just assumed iframes could be used but if it is a security concern that explains why it says unsupported when I try to embed BitTube videos.
Yes, not all iframes are secure. So before we whitelist any domain, we check their reputation and security to make sure our users won't be affected. I have added bittube to list for checking.
the @weedcash community use BitTube as well, thanks for your efforts @ecency!