Planetscale billing

Hi, on account of the Theo's video about Netlify billing I panicked a little. I tried to find a mention about what happens when Planetscale free tier exceeds but only with a little luck in FAQ saying "Databases that exceed the Hobby plan in usage or storage without current billing may experience degraded service." which does not really rule out billing, so my question is what happens when exceeding the free tier? Thanks for any insight.
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