It's insane to even consider using a browser running on somebody else's server. Would you trust them passwords and credit card details? How inefficient is running multiple browsers in one point of failure and streaming a video(?) of it over the net.
I thought of the privacy implications too, but I wouldn’t do anything sensitive on this like enter CC details. An on-prem browser would still be useful for more sensitive/NSFW stuff. I think Mighty caters to the tab-hoarding crowd who notice their computer fans whirring during casual surfing. I never hoard tabs and can’t understand why people do that. If something is interesting I have a bookmarklet that posts a URL to Pinboard and call it a day, and close the tab.
I tab hoard, but I use a side panel (sidebarly) on Firefox with a tab suspender, and use a second, extremely light browser (gnome web) for quick searches. Its a system that works brilliantly. For me.
To be fair I'd say this product caters to the corporate crowd (in my opinion) so it's not much of a concern why any regular person would want to use it. I don't think it's very reasonable to say that your average person will want to pay a subscription fee in perpetuity just to browse the web.
I'd love a 'remote browser' if I could host it on one of my own servers, would help offload 15-30gb of ram usage from my main workstation. Unfortunately I know of no good software for that.