Who do you think the Internet Archive is? They are not Google, they have very low funding, very high expenses and are constantly under legal pressure.
The fact you can even access the Internet Archive for free is a result of tens thousands of human hours striving for one goal. Digital Preservation. If you rely so much on IA, you should consider donating.
I do donate. But that doesn't mean I have to thank them before every meal or think that the service is perfect.
What do you expect them to do though? You have to be a reasonable person.
Data analysis would be a good start, better blocking heuristics, an off-the-shelf solution used by other organisations that don't have this problem, etc.