Is Elon Musk breaking campaign finance law by offering people cash rewards to "sign a petition"?

I say "sign a petition" in quotes because the petition itself is meaningless and only seems to be a thinly veiled way to mobilize conservatives to register and vote through his PAC.

If you do believe this is legal, do you think that what Elon Musk is doing is ethical and should it remain legal?

Link to article.