I think a lot of comments here are missing the reason as to
why these hidden fees have become so much more prevalent in the past 20 or so years. The short of it is that comparison pricing is now much easier to do because of the Internet, and many, if not a majority, of shoppers will just sort by price ascending and pick the first result (or, only pick from the first couple results).
Thus, there is a huge incentive for companies to lower the base price and then get it back with these types of fees. Even if they didn't add BS fees, this ease of price comparison has resulted in unbundling of services in a number of industries - e.g. airlines where the base price is akin to "we let you hang on to the wing", and everything else is an upcharge.
This is also a case where consumers say they want one thing, but their behavior is a different matter. For example, pretty much everyone says they prefer the full price to be shown up front in search result pages. But, as someone who is privy to a ton of A/B testing in this area, the opposite nearly always results in higher conversion, where there is a lower up-front price and fees are only tacked on during checkout.
To be clear, I'm 100% in favor of this regulation because I think it's the perfect example of where what is good for any individual company leads to a dysfunctional market, and so government can provide a level playing field. Heck, I think many businesses would support this change, because they no longer need to try to one-up their competitors by overcomplicating their pricing structure.