I don't think thats a option at the moment at least.
If i was to go this route i would also want to upload to my own network at home and a NAS there.
But 2 things are holding me back on this,,,, well maybe more.
1: i can not get a #2 sim card so i can share all the data on my phone plan i don't use ( which are +90% of it ) with a AP in my car.
2: no one as far as i know support UL to own network and i don't want to pay for 3 person cloud service.
3: while we Danes have a okay cell network coverage, it is not that hard to be in a area where you only have 2 or 3 G coverage, and the several 5G networks that will go up here soon will not change this i think, unless they move 4G they upgrade to 5 G to other places and put up more masts.
4: also while i have like 30 GB data to spare every month on my phone plan ( at least ) then at least on my camera memory cards and me not really driving that much generate much more than 30 GB of video every month.
This could of course be much better if it was only event recordings that got moved to the cloud, mass storage i think will be problematic in regard to cost of moving all that data, and beeing in at least 4 G zone to transfer all that data in real time.