Didn’t test the latest patch, but previously I was able to run it 1080p lowest settings. Played fine but didn’t look great obviously.
Didn’t try handheld mode, so maybe it looks fine on the deck screen

Considering the amount of maps and models added over the years, I don’t really find that enormous

Try having millions of concurrent users all trying to update at the same time.
A single dota 2 update could use around 2-3% of the global internet bandwidth.

Sadly it wouldn’t work if found in a CSV file with other records:

According to EICAR’s specification the antivirus detects the test file only if it starts with the 68-byte test string and is not more than 128 bytes long. As a result, antiviruses are not expected to raise an alarm on some other document containing the test string