It's not really, because the two (telecom and big tech) are in a fight for dominance and focusing on one will benefit the other. It's natural to wonder about the influence of telecom when the Attorney General, under whom the DOJ's investigation is being conducted, was the general counsel of GTE/Verizon for 14 years and then served on Time Warner's board until last year, helping them to merge with AT&T. If you assume the antitrust division of the DOJ has limited resources, and that they were until recently focused on telecom, it's not "whataboutism" to wonder what's driving the abrupt shift to tech.