If you want a quick and easy way to block any website on your Mac using Little Snitch simply…
File > New Rule:
And select Deny, Outgoing Connections, Domains and then type the domain, eg:
Click on create and you’re good to go 
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For me Mac’s built-in features like Downtime (with a few apps Always Allowed) and App Limits (where you can also limit time for certain websites), work fine.
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Nice recommendation. Thanks for this. Does Windows have a similar one?
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I did look at Screen Time but I don’t want even more stuff stored (synced-via) the cloud…
Not sure, do you have anything like Little Snitch for Windows? If so it should be easy enough 
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