As mentioned in the article: Porkbun. A friend of mine uses Cloudflare as they don't charge on top the registration and ICANN fees that they have to pay (or so they say on https://www.cloudflare.com/en-gb/products/registrar/)

But then what's the plan behind this change anyway? Am I going to scramble to buy 19 more domains? Of course not! I'll move and they'll get $15 less a year (or whatever they charge for a .net these days)