Youtube link preview captcha workarounds
Based on my research today we have two options:
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Official Google API support, requiring instance admins to get an API key. This will give an instance 10,000 requests per day which is pretty reasonable https://developers.google.com/youtube/v3/getting-started
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Autodetect Youtube URLs and try fallbacks through Youtube geoproxy sites like clipmega.com which do provide the ogp metadata we need. Clipmega uses CloudFlare so it's not like we'd be punishing their servers.