That's, in large part, because tech is the field most likely to face labor disruption. Most jobs in the US are service, labor, and other such fields where LLMs will have relatively little impact.

Tech will also probably come under attack from two directions. It's not only from labor replacement, but also from a decrease in the value of tech. Right now competition in tech is limited by the relatively large barrier to entry to writing even simple programs. As that barrier disappears, the baseline value of tech will likely decline sharply.