Comment

Please check the following sites (I used the Wappalyzer extension for Google Chrome and checked manually).

These showcases are no longer on WordPress:
https://wordpress.org/showcase/cultural-commons/ - site redirects
https://wordpress.org/showcase/ione-digital/
https://wordpress.org/showcase/vox/
https://wordpress.org/showcase/caviar-tv/
https://wordpress.org/showcase/tonal/
https://wordpress.org/showcase/art-gallery-of-ballarat/
https://wordpress.org/showcase/holzweiler/
https://wordpress.org/showcase/adobe-blogs/ - no such site
https://wordpress.org/showcase/qualtrics/
https://wordpress.org/showcase/momofuku/
https://wordpress.org/showcase/nginx/
https://wordpress.org/showcase/time-com/ (logo on the wordpress.org front page)

Plus:
https://wordpress.org/showcase/georgia-state-university/ - Captcha before accessing the site; from the third attempt, I finally got the working version without blurry video and missing images, so I wonder if it is up to standards.
https://wordpress.org/showcase/ray-charles-video-museum/ - this one wasn't loaded
https://wordpress.org/showcase/userback/ - this one is showing errors due to enabled debug