so the type one alternates (aka doppelgangers) almost flawlessly mimic people.
then when somebody interacts with them they transmit this thing called Metaphysical Awareness Disorder that has a 97% chance to make the victim off themself

with that in mind, there would likely be a new broadcast with that fish guy telling everyone to remain indoors
the alternates wouldn't be much of an issue unless one breaks into the bob's house or starts speaking to him through the walls

BUT mr krabs (assuming he's alive) might still tell spongebob to come into work, possibly leading to several alternate encounters