My rule of thumb is that any organization playing-as-registrar, who is not deathly afraid of getting a reputation as a bad registrar, have no reason to not become a bad registrar.

In practice, this means that organizations like Google and Cloudflare, for whom the registrar business is either a cost center or at best a drop in the bucket for their revenue (and likely the pet project of a small team that is almost certainly being reallocated away from it in this economic climate), aren't registrars I would use or recommend. They can be great for other services though, where there's alternatives if there should ever be a disruption to one's account!