Note the article does not go into detail about how to obtain the data to create the properly formatted blocked_domains.csv files which you can upload. Some of us are working towards providing collated versions of these files but the basic method is to start out copying the listed 'evil domains' from instances which do publish "Moderated Servers". There is a bit of work involved in converting these into pure blocked_domains.csv format but here is one example...scroll to the bottom of the page and click on "Moderated Servers".
NOTE: Some instances with use aster***iks to obscure the full URL of the listed domains, or at least on certain of the listed domains. Sometimes you can extrapolate. It is possible that the block would work on all domains that fit that URL description with the asteriks acting as 'wild cards'. That would be cool but we will have to ask someone who runs a Mastodon domain how that works.
I am a bit hesitant to personally publish block lists because it would not reflect the personal philosophy of the recipients and would probably attract a lot of animosity from the owners of specific domains who don't think their domains should be blocked.
You can also find out ideas of domains fit for blocking by going onto the hashtags for #admin and #fediblock and #abuse
TO FOLLOW: Some examples of actual .csv files you might even utilize.