What are some metrics that justify this claim?
They are also on pace to exceed $1B in revenue. [1]
[0] https://www.reuters.com/technology/chatgpt-sets-record-faste...
[1] https://www.theinformation.com/articles/openai-passes-1-bill...
Views are easy to inflate, I wouldn't even consider it in the same ballpark. This video[1] of Vivaldis 4 seasons has about 1/4 billion views.
The shortest time to 100 million users is almost a definition of the quickest growing company.
[0]: first or second largest youtuber. [1]: https://www.youtube.com/watch?v=GRxofEmo3HA
not credible
well that would be good if Reuters were the source of the figure
but they're not, they're simply reporting on what SimilarWeb has estimated
https://www.similarweb.com/website/chatgpt.com/#technologies
and that estimate is essentially based on nothing