individual miners running datum choose which transactions are included in the blocks they mine they can choose to mine spam

They _can_, but there's no good reason they _would_. They also have the freedom to _not_ mine the spam, unlike with other pools that force them to do so.

Damn. @ODELL too What am I missing. Where are we headed? 🤔 I feel crazy.

Do you see any issue with the changes to default op_return settings in v30?