Google Appears to Have Broken Every Single Instance of Invidious. It's a Wake-up Call, Please Stop Uploading Videos to YouTube.
Including videos of Free software events. Google is making itself deliberately incompatible with Free software.
Recent: YouTube Will Probably be Next to Die
Since some time around midday (BST) yesterday all instances of Invidious have not worked. I noticed this, my wife noticed it (she independently raised the issue), and some people in Techrights IRC noticed it also. It's the same this morning. There's not even one exception and I've tried no less than 200 times.
It's probably fair to conclude this isn't the fault of any one instance or all instances combined but something that changed at YouTube (Google/Alphabet).
If some Free software event uploads videos (typically talks) only to YouTube, kindly remind the organisers that they are in effect requiring proprietary software to watch those videos.
Costs of hosting (and bandwidth) generally went down a lot in recent decades*, so there's usually no good excuses for outsourcing to YouTube other than laziness, which is rarely a good excuse. If one can upload some video file to YouTube, one can also upload that file to some webspace. █
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* YouTube started almost 20 years ago when bandwidth was more expensive. When Linux was new sending around code was still not simple and the Web was new. As Theodore Ts'o recalls it: "Shortly after Linus [Torvalds] had released... I started playing with Linux.... there was very limited transatlantic Internet bandwidth... I set up a mirror archive on my private workstation [...] Someone had to be the head... Linus was natural head... Linus was someone who was a very good leader... quite humble..."