As far as I can tell, binary options on "GOOG below $300 by February 2028" do not exist in the US market. I absolutely think that single-stock binary options are terrible gambling products and should not be allowed.

The thing that I suspect you're intending to describe, a put option expiring in January 2028 (there is no such contract for February) with a break-even at $300, has a different structure which greatly increases its utility for financial purposes and greatly decreases its appeal for gambling. It's hard for a casual bettor to even identify what the correct product is (it was the $355 strike at close of market today, but it may be different tomorrow!), bets are only accepted in increments of $5,500, and your winnings may be minimal unless Google falls either more quickly or more severely. If I'm trying to hedge my Google exposure, though, I'm perfectly happy with the scenario where I didn't win much because Google didn't go down much.