> Somehow, they tend to all place the noun in the same gender.
That's not generally true, especially for German. I've heard "der Blog, das Blog," "die, das Email" "die, der, das Factory" … etc.
Loan words undergo an integration process, which is more of a sociolinguistic concept, I guess. At the end of the integration process, the word becomes an integral part of the language, with a fixed gender. For example, "Manager" is integrated, and it's clear its' "der Manager," same for Computer.
Some words do seem to evoke a certain gender (I've never heard anything but "der Podcast") but you shouldn't assume your personal preference extends to all (native) speakers ("das Podcast" would easily be possible.)
But how do people assign gender during the integration process? It's a consensus process, but there are several factors: lexical similarity (Computer denotes the same concept as "der Rechner" so it becomes masculine. Same for City/Stadt (feminine)) or lexical analogies (this loan word denotes something we already have a category for) morphological analogies (words in -er are likely to become masculine, as many German masculine words already have that ending, same for nouns ending in a vowel and feminine.) Sometimes it's chaotic, but that's the nature of consensus.
This process is much easier in Slavic languages, where gender assignment follows stricter morphological rules. German, on the other hand is chaotic. Note: German is not chaotic for the reasons given in TFA, because formations with -chen -keit -heit -ung etc. have fixed, regular gender. But words which did not undergo a morphological derivation process, but are instead atomic nouns are very haphazard in their gender assignment.