Yes, that's certainly a valid concern. But Pixel Support can help you get the account registered, so you'd be in good hands. You are probably better off doing it now than after the crisis of a system crash, but it's up to you.
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To contact Pixel Support:
On your game screen, choose the Settings wheel in the upper corner. Write down your Player ID and then choose the Support button.
Do not use the white text box in the center of the screen.
Choose a category at the bottom of the page. Then provide your Player ID, Web-based game vs. Mobile, and problem details.
If you do not see the category options on the SUPPORT page, you'll need to email PIXEL Support at: email@example.com . Be sure to include your Player ID.