Jitsi's free service disables video to "save bandwidth" if you have any reasonable amount of participants (3+ in my experience), and doesn't allow you to re-enable it.
Their paid service allows you to tweak this but it starts at $100/mo.
Have never tried BBB & I'm starting to see a lot of folk recommending it here now as I read through the comments... is it available as a service or is it purely a self-host option (website appears to imply the latter at first but I haven't dug into it yet).