"Non-consensually", as if you had to ask for permission to perform a GET request to an open HTTP server.
Yes, I know about weev. That was a travesty.
However,
(1) there's a difference between (a) a regular user browsing my websites and (b) robots DDoSing them. It was never okay to hammer a webserver. This is not new, and it's for this reason that curl has had options to throttle repeated requests to servers forever. In real life, there are many instances of things being offered for free, it's usually not okay to take it all. Yes, this would be abuse. And no, the correct answer to such a situation would not be "but it was free, don't offer it for free if you don't want it to be taken for free". Same thing here.
(2) there's a difference between (a) a regular user reading my website or even copying and redistributing my content as long as the license of this work / the fair use or related laws are respected, and (b) a robot counterfeiting it (yeah, I agree with another commenter, theft is not the right word, let's call a spade a spade)
(3) well-behaved robots are expected to respect robots.txt. This is not the law, this is about being respectful. It is only fair bad-behaved robots get called out.
Well behaved robots do not usually use millions of residential IPs through shady apps to "Perform a get request to an open HTTP server".
In Germany, it is the law. § 44b UrhG says (translated):
(1) Text and data mining is the automated analysis of one or more digital or digitized works to obtain information, in particular about patterns, trends, and correlations.
(2) Reproductions of lawfully accessible works for text and data mining are permitted. These reproductions must be deleted when they are no longer needed for text and data mining.
(3) Uses pursuant to paragraph 2, sentence 1, are only permitted if the rights holder has not reserved these rights. A reservation of rights for works accessible online is only effective if it is in machine-readable form.