with a 10 digit phone number, that’s a 1 in 10,000,000,000 chance someone will get a specific number that you blocked…
it’s a little more because not all numbers are valid, and you’re blocking more than one number… but i don’t think it’s going to be a huge problem…
i do think that “blocking culture” (a term that makes no sense) is a problem online, however…
not only is there a completely opaque process for banning you online, and zero opportunity to talk to a human about it… but when individuals block trolls they continue to troll, but with impunity…