You are just wrong:
> In some circumstances, nongovernmental parties may litigate the lawfulness of FISA orders or directives to provide information or assistance to the government. For example:
> A private company or individual that has been served with a directive to assist in acquiring information under Section 702 may petition the FISC to modify or set aside the directive. Conversely, the government may petition the FISC to compel the recipient to comply with the directive.
> In responding to the government’s petition, the private party has the opportunity to show cause for the noncompliance or argue that the order should not be enforced as issued.
> In 2007, Yahoo! Inc. refused to comply with directives issued by the government under provisions of FISA that have been replaced by Section 702. The government filed a motion with the FISC to compel compliance.
https://www.fisc.uscourts.gov/about-foreign-intelligence-sur...
The warrants the court issues do apply to private parties. Failure to comply with a warrant is contempt of court and the court can compel compliance by fines and other sanctions. You can read what that looks like in this FISA court ruling against Yahoo.
PDF warning: https://donohueintellaw.ll.georgetown.edu/sites/default/file...