It's not enough: due to the multiplicative effect (one ad-server can serve billions of ads and affect countless people), and the hefty fines, the ad-servers simply won't have enough funds to pay the fines and will go bankrupt.
So, your proposal would also need the following measures: 1) fines cannot be discharged by bankruptcy, ever, 2) anyone working at the ad-serving company is liable, and 3) if their money runs out before all the fines are paid, they go to Guantanamo and get tortured daily until someone pays all the fines. If the advertisers are OK with these terms, then maybe we can think about stopping the use of ad-blockers.
So, your proposal would also need the following measures: 1) fines cannot be discharged by bankruptcy, ever, 2) anyone working at the ad-serving company is liable, and 3) if their money runs out before all the fines are paid, they go to Guantanamo and get tortured daily until someone pays all the fines. If the advertisers are OK with these terms, then maybe we can think about stopping the use of ad-blockers.