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I don’t agree. As much as I don’t like FB, I have to admit that they provided a lot of value. People found joy in their products. Facebook before it became this cesspool attracted tons of people. WhatsApp is still hugely popular and useful. Instagram made countless people lots of money and create new means of livelihood.

If your bar for "important company" is "no competitive alternative or reasonable substitute exists for this one companies product", I'd struggle to think of a single "important company" in the entire world.

Many small businesses use their FB page exclusively because they aren't big enough to bother with a real website. There will be a lot of pain for many small employers and their employees if FB software were to go away.

I can't think of a single useful product from Amazon, Apple and currently Netflix. But I use stuff by Google and Meta daily.