I always wonder if these collapses happen all around the world, why does nobody have the decency to simply accept Bitcoin in their local farm as payment?

Of course there are many reasons, probably the most prominent being that you need to download a 400GB blockchain on your device to actually be secure. No wonder all these Bitcoin people want their technology to have as few transactions as possible, because popularity will ruin it's decentralized nature.

This means you will need a custodial solution like lightning which merely uses game theory to create rewards and incentives for following the rules in a decentralized way but ultimately it is still custodial and knowing and trusting the counterparty is still superior.

This gets to the crux of the problem. Due to the custodial nature of scaling Bitcoin transactions, you will have a centralised organization that can be shut down by the government. The local Bitcoin bank or PayPal equivalent will have the exact same problem as any other bank.

If you argue that this entity can exist outside of the borders of the collapsing country, so do USD banks. Despite its flaws even the USD is a better medium of exchange than Bitcoin.