Mojang/Microsoft sometimes issues takedowns for unofficial clones.
While these sites offered a quick way to play, they carried risks: Data Privacy minecraft unblocked githubio 2021
Performance: Running Minecraft in a browser is CPU-intensive. Expect lower frame rates compared to the official desktop application. The Legacy of the 2021 Versions old world generation
If you find a working Eaglercraft 1.5.2 fork from 2021, it is absolutely worth playing. The nostalgia of Beta 1.3 mechanics (no hunger bar, old world generation, the original combat) is a genuine delight. For a student stuck in a study hall with a Chromebook, it remains one of the best time-killers ever created. minecraft unblocked githubio 2021
Click the "Settings" or "Environment" link in the GitHub sidebar to find the live URL.