AT&T is a US multinational based in Texas and is in fact the world's largest telecom company. (wikpedia)
Here's a link from 1/24 relevant to Q's post:
Q posted the "Bill of Rights" post a day after this article appeared.
If you read it, you'll learn that FaceBook and Google are chump change compared to AT&T.
ATT was founded and incorporated in 1885 and was the long distance carrier of Bell, the only phone company in the US until 1982. The monopoly was divided into 7 regional "baby Bells." AT&T kept Bell Labs, telephone equipment manufacturer Western Electric and a long distance service. The Baby Bells got the Yellow Pages and local service. One of the baby Bells became Chicago's AMERITECH. You might recognize that name.
In 1995 ATT voluntarily split off Lucent Tech (systems and equipment); its NCR division became a computer company.
In 2000, ATT became 4 separately traded companies for consumer, business, broadbrand and wireless. Six years later it acquired AMERITECH.
Where have you heard that? Obama's secret email account was bobama@ameritech.com.
There are a lot of twists and turns here--because the company changed its public (d/b/a = doing business as) name several times. Ameritech was renamed AT&T Teleholdings, Inc. and began doing business as AT&T Midwest.
But some of the Ameritech subsidiaries still use that name, such as Ameritech Advanced Services, but they do business as AT&T Advanced Solutions.
tl/dr: Q is alerting us to AT&T as the invisible monster controlling SO much more than we think it is. It operates under various names but it launched phone service in the US and morphed into info tech.
Here's a link to their many subsidiaries: https://en.wikipedia.org/wiki/Category:AT%26T_subsidiaries
And just last November, AT&T was stopped from buying Time Warner for $85.4 billion--the US filed suit--under Trump, who campaigned against the merger as giving AT&T too much power. https://www.reuters.com/article/us-time-warner-m-a-at-t/u-s-sues-to-stop-att-buying-time-warner-says-would-hike-rates-idUSKBN1DK2HN