Once the house is in their name, the law is on their side.
If you negotiate a contract and the other party fails to fulfill their obligations, the law is not going to be on their side even if they got paperwork signed.
Obviously a court is not going to support an eviction if that eviction is part of a fraud. That’s ridiculous.
Can you provide a single example of someone buying a house with a check that bounces and successfully evicting the rightful owners despite not paying for the house?
Where I live that transaction would be void by statute. No court would process an eviction or lien if they the buyer did a felony to get the deed signed over.