Earlier quoted context omitted.
The first amendment does apply to companies. As in they have the right to not associate with you for any reason. However, there are plenty of cases where that right has been taken from them when their services have been deemed so necessary that they must do business with the general public. e.g. the electric company can't cut you off if they don't like your politics. And until recently we had net neutrality. There is…
Net Neutrality was very shortlived in the USA though, like, a few years only ?
That is...not accurate.
Net neutrality was FCC policy enforced by case-by-case action from 2005 until a couple such actions were struck down by courts in 2010 as requiring regulation. After that,the FCC adopted them as regulation in the 2010 Open Internet Order (which had been being drafted before the ruling); certain parts of the 2010 order were struck down by the D.C. Circuit in 2014, saying such regulations could not be applied without reclassifying ISPs as telecommunication providers under Title II rather than information service providers under Title I of the Telecommunications Act. Subsequently, the FCC adopted regulations reclassifying ISP and again imposing Net Neutrality regulations in 2015, which (with new leadership because of the Trump Administration), they withdrew in 2017.
A number of states have since adopted various net neutrality laws, including California.
While the FCC has not yet acted on it, the Biden Administration made bet neutrality executive policy in Executive Order 14036.