Absolutely they do have leverage – maximum they could possibly do would be confiscate Amazon's EU assets (physical, financial, corporate and intellectual)
so they can turn off their own critical services?
threatening to shoot yourself in the foot with a tactical nuke is not leverage
That would require humans to do additional – and very likely criminal – acts of retaliation.
And no one will care about whatever claims of ‘criminal retaliation’ there are, because it’s already crossed that line eh?
It’s not like the domestic employees will be doing it anyway - or would need to be involved.
so they can turn off their own critical services?
threatening to shoot yourself in the foot with a tactical nuke is not leverage