The Amazon Labor Twitter hasn't posted since April 2022. They have so far been unsuccessful in unionizing any other Amazon facilities. According to this article, the union's funding has dried up since 2022, and workers in the ALU sued the union for alleged anti-democratic practices in 2023.
Is it over for them?
In my pov no , no union can have a future by focusing on a sect , for unions to function there is a need for cooperation between unions in different sectors