A Verizon customer might say "my internet was down" but there is 100% a clause in their contract about outages and SLAs.
Any company that lost sales likely doesn't have a contract with them, so what are they going to sue for? "Verizon didn't carry my 1s and 0s for free this morning"? Person A on the freeway having an accident and causing Person B to sit in traffic and miss their sales meeting isn't liable for that...
Maybe their peers (other telcos) have more standing because they couldn't deliver to their customers as a result but they of course all have a clause in their contracts about outages and SLAs that means ultimately they lost no money so there are no damages.
And this is why we need government regulation, either to break up the Telcos or nationalize them