Boosters for vaccines are hardly unprecedented. Pfizer and Moderna, IIRC, are both testing boosters or updates, but on a "Be prepared" basis. At this point, no need for boosters for any of the Covid vaccines has been demonstrated, and the three currently authorized vaccines in use in the US have all been shown to be effective against known variants (as is Novavax's, BTW, for which EUA will soon be requested).
Panic porn sells ads, I guess.