I would suggest to add Discord’s bot to the verified list. It’s used to crawl Open Graph images. Currently, pages with bot protection enabled won’t have any Open Graph images in Discord.
The user agent: Mozilla/5.0 (compatible; Discordbot/2.0; +https://discordapp.com)
Thanks for the suggestion! We’ll reach out to Discord for instructions on how we can verify requests for authenticity. I’m not seeing anything in their documentation about a fixed IP address range or reverse DNS verification.