Own answer to 2: So all existing TLDs are by default "pre-reserved". Secondly, the 100k top Alexa sites refers to the inability to register a ".whatever" if th

Own answer to 2: So all existing TLDs are by default "pre-reserved". Secondly, the 100k top Alexa sites refers to the inability to register a ".whatever" if that "whatever.some_tld" is in top 100k Alexa. So, basically this is "pre-reserving" "gTLD". In my first impression, these 2 things were somehow correlated.