Yesterday, September 19, the
SquareSpace.com platform
site was listed in the Registry of Banned Sites.

In the best traditions of Roskomnadzor, this was done by IP without any worries that there might be other sites on this IP.
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What was the cause of the blocking?
Judging by the information from the resource
http://antizapret.info/ , this was done because of the
http://loooch.com/ebooks page, where, in particular, these are the textbooks:

The SquareSpace administration says that they are now investigating this issue and advising them to wait.
PS Honestly, I would not write this post if the platform did not have the site of our agency, for which idle time is critical even for 1 day. The only solution I can see now is to export the site from SquareSpace and quickly transfer it to WordPress. Well, or, really, wait until the SS will deal with Roskomnadzor (which I personally doubt).