Do not use Oracle.
Or any vendor that try and locks in their customers.

No need for that cave, a Faraday cage would do for cell signal blocking.
If you want to be extra careful, the game would be in an anechoic chamber. Any buzzer would sound loud, even if, ahm, hidden.

Just set routers to limit individual band when connection is saturated.
Or install more Starlinks antennas.

Same in Brazil. Biodegradable bags are just a little more expensive than old non-biodegradable ones, but we're OK with this, since environment is a very sensitive matter here.

Would a bicycle air pump work?

One thing is old tech, another is dead tech.
There's no more manufacturers for floppy disks and drives. The only seller in business is recycling the disks.
When you operate multi-million dollar machines that gives multi-million dollar profits, or when life depends on it, you want to solve problems before they happen. You don't wait the brakes of your car to fail to only then replace them. And you replace them because they're worn out, not because they're not fashionable anymore.
If it was with me I'd see a floppy drive as a "ticking time bomb" problem just waiting to happen at the worst moment possible.

It's like taking antipyretic medication to faster reduce a fever while an antibiotic treats the fever cause.
As stated in the summary, it's not a substitute for decarbonization, but it can buy the world some time do to such decarbonization in an less hasteful way.

Even being non-American, I would be so happy if the hypersonic missiles USA is testing were... inspired from China's ones.

Looks like a distinct doctor just turned his flux capacitor off.

There's more. Surprisingly, the provided-for-free tax filling software doesn't suck, it's easy to use, and it's multiplataform (Java). Now there's even an web app if you don't want to install anything.
And there's a great new feature lately, depending on your Gov.br account status (must be "gold", which is fairly easy to obtain, i.e. using a personal digital certificate to login grants instant gold status), in the web app the forms come pre-filled.
I used the web app like this this year, just reviewed and updated some data, and sent. Done in 15 minutes because I was careful.

I don't know much about American tax system, so this maybe can sound like a naive question, but... Isn't this a perfect case for a free and open source software solution? What are the impediments? Complexity? Legal accountability? Does this software needs a permit by IRS?

You know, people have this habit of anthropomorphize everything. I think they mean "most isolated".

He wants to exercise, but not to sweat. He wants to commute easily but don't wants a motor. He wants a hybrid riding experience but don't wants the ride to be a mix of other machines.

If my phone is broken?

I was sick of those shaky, too close, out of focus policial videos.
Now they should pass a law enforcing horizontal filming.