Atlus may have some avenues other than copyright or trademark infringement, at least in the EU, for example with the Unfair Commercial Practices Directive, by arguing that there 1) there is a commercial purpose (ads on the RPCS3 website), and 2) it's using Atlus intellectual property without permission and may be cause business damage.
I suspect there may be similar grounds in the USA for an injunction like this. Whether they really have a strong case is another matter, but indeed it's not like the website owners have the funds for legal recourse.
I suspect there may be similar grounds in the USA for an injunction like this. Whether they really have a strong case is another matter, but indeed it's not like the website owners have the funds for legal recourse.