The short answer is that historically, we only had room for a very small percentage of backlinks because web search was the main part and we didn't have a ton of servers for link colon queries and so, we have doubled or increased the amount of backlinks that we show over time for link colon, but it is still a sub-sample.
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I guess these things need to be repeated once in a while but I feel kind of ... old now; I thought "everybody" knew this.