Indeed… IPv6 needs to be actively disabled, not enabled, by default.

Unless your ISP provides IPv6 connectivity, which gives every endpoint a globally-routable address. Firewalling at the router only works because of NAT.

I can’t change my router’s DNS

Do you mean you can’t change the DNS server in the DHCP settings or the server the router itself uses? In the first case you might be able to use Pi-Hole’s DHCP server instead, while for the latter it shouldn’t be an issue - I actually usually leave upstream servers configured there to avoid loops. BTW, you might also be able to flash OpenWRT to your router

A $13 billion fine does not look like a “cost of doing business” scenario to me.

European law generally isn’t precedent-based, but the commission already put out a statement saying that “pay-or-okay” models are not GDPR compliant. https://www.edpb.europa.eu/system/files/2024-04/edpb_opinion_202408_consentorpay_en.pdf

“In case a gatekeeper does not comply with the obligations laid out in the DMA, the Commission can impose fines up to 10% of the company’s total worldwide turnover, which can go up to 20% in case of repeated infringement.”