It's was more voice acting than just a single cameo. There are also a few smaller TV movies, two sitcom episodes, reoccurring voice acting for one franchise, several smaller voice acting.
I'm not calling that a ton of work, but he's still been popping up here an there. Plus after Spaceballs 2, who's to say he does anything else? In 20 years you'd see one extra movie on there and visually it would be considered a one off.
Oh and that franchise role. When I look up the cast of Brother bear. It's the third listed character. That's not just a cameo that's a full voice acting job, unless you want to insult all voice actors and tell me otherwise.
EA dying is good news. At least this way popular IPs can live on under new management or be sold off.