If you didn't feel the machine in all those other cases it has gone full swing since then, that just means these two attempts were extremely crude by comparison (and they were indeed). But Cambridge Analytica has really ushered us into a new era of manipulation, where most citizens don't even have the slightest chance of perceiving how they are getting played by nefarious actors. And that was just the tip of the iceberg. Today we have stuff like the Saudis buying access to Twitter/X after getting busted for planting literal double agents inside the company. The level and sophistication of propaganda we see right now is unprecedented in human history.