Preventing spam

We are a pretty robust marketplace platform designed on Softr (RestauRent.com) but the issue that we are trying to solve for is spam.
The way our system is designed is that people can submit inquiries to restaurants and if they are not logged in, it auto creates them an account during the request process.
We currently have a system that if a user is logged in and marked as “spam” then they are not able to complete any actions that allow them to communicate with venues but we recently had someone bypass this by just never using their signed in account so always submitting inquiries as a non-logged in user

I know we could make our site for logged in only but that ads another friction point to the process so trying to see if anyone has any tools/tips to prevent this

  • IP logging systems so we could block in cloudflare
  • etc

If a user can submit proposals without making use of your auto-signed account process, then you must fix or close the ‘backdoor’ the spammer has found.

If submitting an inquiry requires an account and spammer has found a way to bypass it, then why not reinforcing the send inquiry form logic?