Yes, leave it blank if you do not have one.
Since you are a subcontractor of Lyft, you will enter your income into Schedule C for your own self-employed business. When you start to go through this section it will ask for an EIN, but that is referring to the EIN for your business, not the business that paid you.
The answer above by HelenaC addresses this question well. Please take a look at it for more details.
@twsampsell
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