I used to do this on one of my sites that was moderately popular in the 00’s. I had a link hidden via javascript, so a user couldn’t click it (unless they disabled javascript and clicked it), though it was hidden pretty well for that too.
IP hits would be put into a log and my script would add a /24 of that subnet into my firewall. I allowed specific IP ranges for some search engines.
Anyway, it caught a lot of bots. I really just wanted to stop automated attacks and spambots on the web front.
I also had a honeypot port that basically did the same thing. If you sent packets to it, your /24 was added to the firewall for a week or so. I think I just used netcat to add to yet another log and wrote a script to add those /24’s to iptables.
I did it because I had so much bad noise on my logs and spambots, it was pretty crazy.
Step 1: License the technology for very cheap or free to competitors.
Step 2: Include features but its free because ads. Pay small monthly fee for ad-free.
Step 3: Revise CANNBus or replace it with new system. Make it a ‘standard’ so that aftermarket units can provide features but will also serve ads from the original car manufacturer and its DRM. Anyone reverse engineering the system gets sued into the ground for DMCA/Copyright laws because now they are bypassing DRM.
Step 4: Everyone gets ads regardless. Also, you must pay subscription fee to basically use the car. Ads are to “keep costs down” for features and/or car purchasing price.
Step 5: After everyone is mad, give slightly higher cost for subscription for ad-free.
People that complain are told 'It’s just one coffee a month. No big deal."
Step 6: Offer a 5-year (non-transferrable or refundable) plan that you can just roll into the price of the car loan and ‘locks in the price’ and 'You don’t have to worry about it anymore." Maybe toss in lame very small discounts for certain branded charging stations while on the plan. People already sign up for credit cards, give away their personal info. and become loyal customers to gas stations to save single digit percentages off on fuel.
People that buy new every 5 years usually buy the package.
People that try to save money and buy used cars pay the subscriptions.
Step 7: Double monthly price for ad-free tier and market it to “we had to raise prices for those that want a premium experience but kept the ad-based subscription fee cheap. We had to pass the cost somewhere.” This will increase the demand for those 5-year plans.
Overall new car purchase demand increases a bit because of those plans.
Over the course of 15 or 20 years there will be an entire generation of drivers used to ads always being in cars and will just accept subscriptions and ads are just the way it’s always been that way and that it must be that way.
For the EU, it’ll probably be different where the car can perform basic functions without ads but ‘premium features’ for stuff like traction control, auto lane following, etc. will probably still be behind the system I’d imagine.