Companies like news org's, online retailers, streaming services ... including those companies that sell things you need to buy, can buy extra bandwidth consideration from your ISP, meaning that their pages will load effortlessly while the others may load erratically or ... maybe not at all. Without net neutrality, Big Business can essentially manipulate, even censor what kind of information and products you see through being favoured by the ISP they give money to.
And, sites that used to be free to use (like Imgflip) may end up costing you for continued membership. You will be censored based on your ability to pay, essentially. If you can't afford to pay, you're SOL.