What responsibility is possible for a spam attack on a site if the entire site is flooded with spam?

Question

Law in IT

Let's say there is a site like a forum or questions \ answers.

And someone made a bot with which he fills up this entire site with spam. Moreover, it fails, that is, because of spam, it becomes very difficult to scroll through posts and find something that is not spam.

Has a huge number of accounts and registers new ones. With IP, everything is also sad, the number of proxies used is such that, based on these statistics, you can compile a blacklist of proxies no worse than Google's, plus it has some other IPs, possibly a viral botnet (but this is not certain).

Of course, when the spam started, the site had to introduce strict measures such as prohibiting registration, requiring ReCaptcha v2 for every action. (Soft measures like changing forms or using regular captcha didn't help, because the spammer had a couple of juniors right there 24/7 and ruled this bot.)
Hard measures stopped spam.

After a while, these measures were canceled, spam was repeated, and so on.

And so several times.

Two questions:
1) Is it possible to bring the spammer (and his employees - the same two juniors) to legal liability? And to what?
2) And if the site belongs to a large corporation, up to some Yandex, then they should succeed?

I repeat once again:there is so much spam that it is impossible or almost impossible to read something and write comments on the site. All feeds of posts are flooded with a huge stream. In fact, the effect is the same as from a DDoS attack, people cannot use the site.

Answer 1

Is there any damage (including potential)? There is. Is there intent? There is. So you can be attracted. And it's usually quite easy to spot such a spammer. Whether responsible employees want to look for him is another question.
Separately, I note that some large corporations may have their own investigation departments, whose methods may not be as humane as those of representatives of the law, but much more effective. This is if you are suddenly interested in those same spammers.