Right, but some of these passion projects in turn become breakout hits that breach the 100k barrier then presumably generate revenue for Unity - think of indie

Right, but some of these passion projects in turn become breakout hits that breach the 100k barrier then presumably generate revenue for Unity - think of indie games that break out into mainstream built on Unity like Among Us or Valheim. If the reduction in passion project games is significant enough it might well have an impact - especially as fewer "AAA" style development houses pick Unity.