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Will probably be enforced via licensing. Maybe even self reported. Probably has a clause giving them permission to perform audits of your sales.
I doubt they will spend that much time. Just state you owe us x. If you appeal, you have to proove sales from your different channels.
There is no way they'll just make up a bunch of invoices for small developers. That would be too time consuming, plus they'd need to show reasonable effort in determining the invoice. It's best to just let the devs do all the work with the fear that an audit can cost them so much more money than they'd save if they lied.
They have telemetry. They probably know when a game is downloaded. They probably don't know if it's legitimate. They just auto bill based on telemetry and leave devs to dispute or suck the big one. Only effort needs to go into disputes. Big clients will obviously get quicker resolution.
No company would trust devs to be honest about downloads and it would be too expensive to verify.
They don't need to audit much, just need a steam, epic, and itch total downloads figures.
They'd have to do best effort against charging devs for pirated copies.
Telemetry is also easily blocked. As a business, I'd trust that a lot less. It's why many enterprise licenses are simply self reported. The punishment isn't worth lying enough to make a difference.
Most companies would trust devs as the devs are not big enough to survive a legal fight they'd certainly lose with prejudice, meaning they'd pay court costs as well.