Comment by beefnugs

Sorry but it is actually a completely wrong solution. This is not a "make it expensive for spammers" problem. They only need to download the source code once, with a background process that doesn't matter if it takes hours.

Besides the "got the source code for training data" , the other access scenario is just downloading to an end users "agent" Which again, the end user is running something in the background, doesn't care how long it takes, how much it costs, its not a volume or spam type problem