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There is now one hunger striker in front of Anthropic and two in front of Google Deepmind.
https://x.com/DSheremet_/status/1964749851490406546
Guido has already repeatedly done protest and even gotten arrested multiple times in front of OA. I don't know his exact reasons for choosing Anthropic now, but spreading the protests over the different actors makes sense to me.
People also asked the same kind of 'why not ...' question when he and others repeatedly protested OA. In the end whatever reasons there may be to go somewhere else, you can only be in one place.