It's mainly in the USA it seems. In South Africa, we have had internet banking since 1995. So businesses stopped using checks around that time. Phone banking with DTMF was popular around that time as well. Bank transfers we used more than checks for businesses before then.
For individuals, debit cards became the default around the same time. Same functionality as a credit card, without the credit.
Then Internet banking became mainstream for individuals around the 2000s when everyone got access to the internet on their phones.
Cash remained popular throughout since ATM infrastructure was very good in South Africa.
They can also redirect that traffic to their own DNS servers, so you think you are using 3rd party DNS, when you are actually still using theirs. This became legal when the Trump administration got rid of net neutrality legislation.
They do worse than block it, the redirect it to their own servers.
And the data is worth it at volume. They have hundreds of thousands of users, along with the region they are in, as well as data on what websites they visit.
Advertisers have and continue to pay for that data.
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