It's largely been the House side that has taken the lead so far, but a new Democratic Senate would also be interested in regulating Apple's "services" including the App Store.
They can easily get enough Republicans onboard to stop a fillibuster. After the Parler situation, Republicans would no longer feel the need to defend Apple's App Store margins (regardless of whether or not Parler can come back under the proposed laws, the political damage is done).
You're missing my point. It will be far easier to get laws changed than to develop a whole new phone.
The party that will control Congress in a couple of weeks does not like trillion-dollar companies like Apple. They believe that Apple and others should be considered monopolies, and if there is a court case they believe Apple should have the burden of proving that they aren't a monopoly (unlike current law).