My guess is that offline advertising has become cheaper and so they do more of it.
I live out in the country now. There are no outdoor ads here. I like it.
(The local weekly paper is called The Advertiser: an apt name, for it’s about ¾ ads. But I don’t look at it. My life is basically completely ad-free except when I go down to Melbourne.)
Some of the ads are hilarious. Some are for the services that are not common in the USA. Nintendo has some where they add in a trivia Q&A, the format being, Question->Ad->Answer and I usually find them interesting and I'm often happy to learn about whatever new Nintendo game they are showing off. Often there are ads for theater plays, concerts, museum events that I only find out about because I saw them on the train.
I also like some of the campaigns where they decorate an entire station or the entire train, the entire car.
Now they are still doing that, but they have compounded the awfulness, because now they track where you are visiting and push more of those ads in your eyeline. Switched device, tough, the ads do too. The advertiser now also knows who looked at the ad, where they came from to see the ad, where the left to after they saw the ad. And then what they did for the next 2 weeks, so now they can make sure their ad is in front of your eyes whenever they want because they tracked your browsing habits.
Advertising was bad before, now it is insidious tracking and monitoring of users, under the pretense of advertising. /rant