I don't see it as childish. I see their ban of epic as childish. This I see as them being on their high horse as always. Treating everything not apple as trash and criminals
It's childish because they are "complying" with EU rules but in such a way that they are risking to anger the EU regulators, and therefore be investigated more and more. The most intelligent way to act would be to get on well with the regulators, even if they don't agree with the imposed rules, as they have more to lose than to win. Imho.