I did a google search and it is mentioned, first result even…
https://www.google.ca/search?q=samuel+jackson+alexa+skill+discontinued
https://www.amazon.com/Samuel-L-Jackson-celebrity-voice/dp/B089NGHR7K
That was my assumption but the original announcement said 'until April 2023' and now says 'June 7 2023' but 'Hey Samuel tell me a joke' is still saying the same jokes it has been saying for 3 years (just now "Why did the banana buy a muscle car? So he could peel out".