After our next update, likely sometime next week, Algo sizes will be limited. We are currently planning to limit sizes to 15mb. Note that a vast majority of algos are code-only and use much less space, and that this only affects users who are uploading a significant amount of data or information along with their algo.
We wanted to allow as much flexibility as possible to see what everyone does with it, so we initially set the upload size limit to something extremely high. Unfortunately, the main limiting factor on the size of uploaded algos is now internet speed. Large algos would lead to network requests timing out and failing, and most users would start seeing issues after ~20mb. This also gave a small advantage to users with faster internet speeds, letting them upload larger algos. It also led to a negative user experience where players are encouraged to attempt to upload the same large algo many times until it works.
As always, let us know if anyone has comments or concerns