Hello sailer44.
Thank you for using Apple Support Communities. There are certain options you can adjust and edit for filtering messages from unknown senders. You can review those steps here: Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support
To filter messages, go to Settings > Messages, scroll down and turn on Filter Unknown Senders. In Messages, tap
Filters, then tap Unknown Senders. You won't get notifications for these messages.
It also states this information as well:
You can report iMessages that look like spam or junk from the Messages app. If you get an iMessage from someone who's not saved in your Contacts, you'll see a Report Junk link under the message. Tap Report Junk, then tap Delete and Report Junk. Messages will forward the sender's information and the message to Apple, as well as delete the message from your device. You can't undo deleting a message.
Reporting junk doesn't block the sender from being able to send another message. If you don't want to receive these messages, you need to block the contact.
There doesn't appear to be a built-in option to fully disable the button to report a message as junk. We encourage you to leave Apple feedback on things they can change or update here: Feedback - Messages for iOS and iPadOS - Apple
Thank you for using Apple Support Communities. Cheers.