It appears that Amazon has quietly removed its Anime Strike service. Anime Strike provided users with anime streaming content, but it was only available for Prime members with an additional $5 monthly fee on top of that. The Anime Strike catalog can now be accessed by regular Prime members.
Series like Made in Abyss, Land of the Lustrous (Houseki no Kuni), Inuyashiki, Girls’ Last Tour, and many more can now be watched legally through Prime Video at no additional cost beyond an Amazon Prime subscription. The Anime Strike Twitter account has also been deactivated after a period of inactivity. Amazon did not pick up any exclusive titles for the Winter 2018 season.