Yes, comparing to Porkbun for .com and .net, it looks like you'd need at least around 10 domains before it became cost effective (the .org price there says it is time limited and I think does not reflect recent .org price increases).
There's also the matter that, ethically, openprovider seems to be heavily focusing on domain name speculators as clients; that may be a business many people would not want to support, and their services for people actually using their domains may be poor.
> There's also the matter that, ethically, openprovider seems to be heavily focusing on domain name speculators as clients
Do you have more info about that? I'm a customer of them and didn't know this.
I actually noticed that quite a lot of (smaller) hosting providers are also customers of Openprovider. (When transferring some domains from other providers to my account as Openprovider, they turned out to be internal transfers.) So I'm a bit surprised about it.