I don’t disagree, but the power to remove your own IDs is not really that much leverage unless you happen to only be on iNat to get IDs on their taxon of interest and they’re the only expert with knowledge on that taxon.
Edit: based on more information below, their behaviour sounds more reasonable although still a bit odd.
If there was a pattern of this then I suspect the response would be different.
That gets into legal territory, see e.g. this discussion and links to it.