That seems to be a pretty effective way for now to keep scrapers, spammers and other abusive behavior away. Normal users don't do certain site actions at the speed that scraper bots do, there's no other practically relevant search engine than Google, I've never ever seen an abusive bot hide as wget (they all try to emulate looking like a human operated web browser), and no AI agent yet is smart enough to figure out how to interpret the message "Your ISP's network appears to have been used by bot activity. Please write an email to xxx@yyy.zzz with <ABC> as the subject line (or click on this pre-filled link) and you will automatically get unblocked".
[1] https://developers.google.com/search/docs/crawling-indexing/...