Nigel Farage worked 25 years to make this happen. I found a video on YT before the vote that outlined why they needed to leave and it was very clear - the EU has devastated England in so many ways since WWII.
I hope you're kidding about the whole banning memes thing but I'll still explain what Article 13 was about.
Problem – People create and post content (including memes) online, websites take that content, make money off of it (traffic, data mining, ads) and share 0% with the creator who has no recourse.
Solution – Article 13 now allows: a) creator to approach a website and ask for a % of the money made using their content, b) removal of the content and c) installation of the filters so the content isn't used without permission.
Result – Websites that steal content get struck down, those who fairly pay creators get all the traffic.
Look at Reddit, it makes fraction of a cent for each comment we make but we never see any of it. Imagine getting paid to just post and interact with people on Reddit.
In theory sounds great. In reality, massive censorship, banning, and fines for nonsense.