Owing to its unpopularity, or to which its unpopularity owes, Apple has only supported dual SIM for a few generations.

> Curiosity: what are the use cases for two SIMs from the same country?

I have one line on Verizon and one on T-Mobile for better coverage, robustness to congestion.

iOS 13 has a "cellular data switching" feature for dual SIM that automatically chooses networks based on availability.

Data from one network even provides "WiFi calling" capability for the other line.

> I have one line on Verizon and one on T-Mobile for better coverage, robustness to congestion.

For cost & complexity reasons, this is a very niche need.

Complexity is virtually zero. The most non-technical of person could set it up. Cost however is a valid point, but like OP I rationalize the cost.

The databases contain the metadata (authors, edition, ISBN, etc.) for the books.

Thus, 32 TB of books (over 2 million titles), 3.2 GB database.

Ah, that makes sense.

To make sure I'm understanding this correctly:

The Libgen Desktop application (which requires only a copy of the database) would then use the DB metadata to make LibGen locally searchable, and would only retrieve the individual books/papers on request?