I mean, without this law, are the people not allowed to use computing? What exactly is the difference it brings? Does it force government to provide computing to all citizens?

Here's the actual text of the law: https://legiscan.com/MT/text/SB212/id/3078731

I mean, isn’t there also law that says people have basic rights to food, housing, healthcare?

What will this law change, effectively?

What does this make with Montana?

Here is the official text: https://bills.legmt.gov/#/laws/bill/2/LC0292?open_tab=bill

Um. Montana resident here. The state also had quite strong anti-corruption (aka campaign finance) laws, since the copper baron days. But the US Supreme Court ruled that doesn't matter (because their corruption trumps any state anti-corruption law presumably). So don't expect this to amount to anything.