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This would be a disaster for startups and hobby sites hosting user-submitted content without a significant minimum size or revenue threshold.

It would definitely be the end for one of the sites I run (which received only one DMCA request in 22 years of operation).

Incumbents will love it and will look at the cost of the mandated software as an insurance fee against future competitors.

Any other user submitted web site will die or never be. Sorry about that.

BTW, are mobile apps not backed by a web site in the scope of that legislation?

Or all your successful competitors will be European, African, Russian, Chinese, Indian, etc..