Since most commenters consider them pointless, I'd like to add another perspective: Personally, I won't travel half around the world (or just my own country) to attend a conference I prefer to follow on my own schedule and from the comfort of my home and therefore consider those streams very valuable.
That said, most conferences had this option before it became a necessity. So having the conference in real life while making it available for everyone remotely is obviously the best of both worlds, but declaring the latter remote-only conference worthless seems like an exaggeration to me and certainly doesn't refelct my point of view.
On a sidenote: You might enjoy Confreaks, which covers a whole range of those conferences: https://confreaks.tv/
That said, most conferences had this option before it became a necessity. So having the conference in real life while making it available for everyone remotely is obviously the best of both worlds, but declaring the latter remote-only conference worthless seems like an exaggeration to me and certainly doesn't refelct my point of view.
On a sidenote: You might enjoy Confreaks, which covers a whole range of those conferences: https://confreaks.tv/