[1]: https://old.reddit.com/r/GoldandBlack/comments/rs2wqr/appare...
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PS. Here are a couple of things that I think are worth clarifying:
* This about them blocking links to the websites in an SMS message, not DNS blacklisting or deep packet inspection.
* Their blocking system seems pretty dumb in general. Apparently, it is even blocking lichess.org [2], the whole .xyz TLD, and stochastically Jacobin (the National Review of the left).
[2]: Thanks to @lynndotpy for confirming this.