My googling kind of indicates these are VoIP providers. But it still seems weird there are this many.
My vague guess is that these many providers have existed primarily to facilitate robocalling - to force the FCC to play wack-a-mole to get rid of them and FCC is now acting on them en masse, which might be more effective. But people who know this stuff might pipe up on the question.
My vague guess is that these many providers have existed primarily to facilitate robocalling - to force the FCC to play wack-a-mole to get rid of them and FCC is now acting on them en masse, which might be more effective. But people who know this stuff might pipe up on the question.