Yes, I think it is correct to say that, anyone can write if the bucket assigned to their pubkey is large enough. The publishing capability changes depending on the rank, users with high ranks get more events to publish per day. On the other hand, new npubs can only write one event per day, which must be of kind 1 and without urls in the content. If the reply guy spins new npubs each time, the relay will likely consume them. However, the key point is that this is the current policy we have on the wotr.relayr.xyz instance. You can run your own and tweak it to configure different thresholds and also to enable or disable publishing for users with no rank. You could also disallow anyone from writing below a certain threshold. Together with the ability to self-host your own relayr instance, makes it very customizable to each person's needs and communities. Also, remember that this is an experiment we are running, and so far, it is working great