Edit: is it just that they are a German company?

Yes, they are.

Often times there's just no reason to package a web app into an app container.

You're missing that the climate crisis is not a problem that can be solved by consumers, that's what BP wants to make you believe by introducing the carbon footprint. Those companies are actively working to hold on to the status quo because they have lots of money flowing their way until things change.

The message behind this is not to stop buying from those companies, it's that they are knowingly destroying our future and that we have a right to defend ourselves and this future.

They pledge to defederate from Meta, I'd go one step further and defederate from any instance that federates with Meta.

They shouldn't just defederate from Meta, they should defederate from any other instances that federate with Meta. Like a firewall against late stage capitalism

I think there should be an alliance of instances that defederate from any instance that federates with Meta.

A bit pessimistic though.