They risk getting fines for not releasing a feature? The EU is insane

No, they're not risking fines that way. They are free to not bring such features to the EU-market which prevent a level playing ground for competition.

But they were found to have already skewed the market with several Apple-accessory-exclusive iOS-features in the past (Proximity pairing, Watch-integration, etc.) and for those they have to provide interoperability now.

They worked with the EU for a year now on how exactly they should reach compliance, then the ruling was made, ordering them to make such interoperability features also available to other brands than Apple.

Now it seems that they try to rally their userbase against that ruling, in hopes to create a political climate that gets the ruling revoked again...