> The threat model I work off is "fascist government seizes power in the United States and sequesters all data for all citizens from the top 15 large corporations".

Dragnet surveillance of telcos, along with network/traffic analysis, which we've known about for a while, means avoiding any particular tech company is going to be irrelevant to concealing that you are an “undesirable” in any case unless you've taken pains to have your basic telecommunication somehow untraceable.