

“While we are committed to providing reliable and affordable internet service to customers across the country, New York’s broadband law imposes harmful rate regulations that make it uneconomical for AT&T to invest in and expand our broadband infrastructure in the state,” the company said in statements provided to CNET and Ars Technica.
This is blogspam. While Ars Technica put this quote near the beginning of their article and wrote an article afterwards to put it into context, this short article gave AT&T the very last word.
It would probably have to be a clean install that wipes userdata, not an upgrade. But yes, LineageOS is pretty much as degoogled as you can get on an OS forked from Google’s AOSIP, if you don’t explicitly add GApps.
German privacy researcher Mike Kuketz does not agree, but it all depends on how much effort you’re willing to put into degoogling, or how much you’re willing to compromise on usability.