Shouldn't we be able to make these systems useless by filling them with loads of fake data/spam? I.e. if I have to fill out a form somewhere, I would not only

Shouldn't we be able to make these systems useless by filling them with loads of fake data/spam? I.e. if I have to fill out a form somewhere, I would not only submit it once, but several times (ideally automated), ideally with realistic data, i.e. other businesses in my area (so geo-location won't raise a red flag then). If I visit the next website which employs the same network, they can't really identify me - they have a big set of businesses I could possibly be (or they just take the last one, which would be fake). At least currently, they do not seem to verify whether the filled out form can be properly validated, i.e. if the user clicked on a confirmation mail or similar. Anonymity by obscurity :)