https://notionforms.io/pricing
https://notionforms.io/register
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Based on the google search: site:notionforms.io/forms/ returns ~432 results
I suppose all of your customers forms are public and indexed by google. This means anyone (a competitor or some wrong-willed person) could see the forms questions and send bad data by answering them. If I were your competitor, I would answer some of these forms doing marketing for my product: “check out my notionforms alternative - less expensive yadda yadda” - instead of actual answers. First, this would pollute the database behind this form and secondly it would show how easily strangers can find and complete such form.
Having all these forms (entry-points) public makes them really easy targets. Just an idea, these forms could be used for newsletter-like campaigns. If I were to market another product or something complementary to notion/notionforms - completing these forms in a personalised way I could just that.
For sure, letting google index these, helps your SEO rankings, but it might cause issues for customers at some point. Not sure if such information exists on your site, but there should be a disclaimer saying that the forms are actually public for anyone (not only for the people having a link to the form - or seeing the embedded version).
Recommendation: block google from indexing /forms pages.
Can you stop someone from wrongfully embedding notion forms? If you have the public access link (without an expiration date), I think it’s very easy to embed the form anywhere.