Subsidy in this context was meant to convey that all the bandwidth and infrastructure that allows for global communication for billions of people is paid for by the advertising Meta sells, money that obviously disappears if Meta disappears.

That doesn't mean we won't have money to pay for it though. All that advertiser money comes from the consumer too. Companies pay it to sell things, and to make a profit they factor it into the price. We're paying for it, we just don't pay Meta directly.

If meta would disappear we would either buy less and have more money to pay for communication (and doing more towards saving the planet as well!). We'd probably choose things to buy more on actual need and quality rather than marketing BS.