Republicans want deregulation everywhere, no matter the cost, the second you talk about limiting big business or monopoly busting they run away.
Democrats on the other hand rely heavily on favors from the tech establishment to keep their agendas front and center and hide any downsides, this means letting BigTech(tm) have free reign.
Thus both parties are incentivized to look the other way. Only recently did the Republicans wake up to TOO BIG = bad; but their solutions are all terrible and thankfully were never entertained by any meaningful majority. Meanwhile the democrats are working very hard to cement the current big tech conglomerates into having control and power so you can expect more of the same.