If one company in an industry faces higher costs, they may not be able to raise prices, as they would lose customers.

If all companies in an industry suddenly face higher costs, that shifts the supply+demand equilibrium.

They're not just competing against other companies though, they're also competing against piracy which places a much needed downward pressure on prices.

EDIT: OK I got educated here. Must drink my coffee before posting next time.

Companies don't seek to maximize revenue. They seek to maximize profits.

Looking at the demand curve alone does not tell you the equilibrium price.

If every point on the supply curve increases by 5%, this will almost change the price at which the supply and demand curves intersect.

Because it wouldn't have increased profitability?

See: https://en.m.wikipedia.org/wiki/Tax_incidence

> If they could increase profitability by raising their prices before the tax, why wouldn’t they have already done it?

Because now they have an external reason they can point to, similar to “inflation”… even if the extra charges end up being mostly profits.