I found this interesting:
https://oxylabs.io/blog/is-web-scraping-legal
So, is web scraping activity legal or not? It is not illegal as such. There are no specific laws prohibiting web scraping, and many companies employ it in legitimate ways to gain data-driven insights.
However, there can be situations where other laws or regulations may come into play and make web scraping illegal. For example:
1. Your web scraper should not log in to websites or web pages and then download data. By logging in to any website, users have to agree to the Terms of Service (ToS), which may forbid activity like automated data collection.
2. There is a misconception that you can do whatever you want with publicly available data. While there may be fewer restrictions for scraping publicly available data – as opposed to private information – you still have to ensure that you are not breaching laws that may apply to such data.
One example would be downloading copyrighted data. Usually, it includes designs, layouts, articles, videos, and everything that can be considered creative work.
Well, the Mumsnet logo is certainly copyright protected. Surely all the written material can also be considered to be creative work, too?
Aston initially said that they wanted to cross reference, in order to identify users on other sites, didn't they? Would that not count as doxxing? It's not generally illegal in the UK, unless there's malicious intent or result, such as harassment of a poster.