I just learned that scraping the web is not always as legal as I thought it was. Apparently a website can prohibit the use of web scrapers for their website in its Terms Of Service.
The translator deepl.com has a API which costs money. However, on GitHub one guy published a tool that allows everyone to implement the functionality of deepl.com in their own programs. He basically wrote a free API.
Did I assume correctly that this guy makes himself liable to prosecution? Is it illegal as well to use his tool (1) and publish free software using it on GitHub (2)?