"Our immediate calls for assistance at their github were met with hostile and unhelpful comments - after a while, our request was even tagged as "off topic" and closed. We were shocked to receive an even more aggressive reply from them in our Support the next day."
Immediate? 13 days ago, Gulden v2 came out more than 2 month ago
Hostile comments? Maybe short and dry instead of super friendly explaining him basics of how blockchains work. It's github, not slack/forum chat. Some understand the difference, others obviously not.
Other side of the story:
https://dev.gulden.com/a-clarification-on-coinomi/They (coinomi) demanded money to delist NLG because they could not handle the chain?
And for those who can read a block format:
https://github.com/Gulden/gulden-official/issues/138LOL he sees a block getting orphaned after the chain tip increased (longer chain), doesn't understand it and demands changes to keep the orphaned one valid (means to invalidate the valid one with the rest of the valid blocks following).
Make a guess what would happen than?
The first block he saw (the orphaned one) was only propagated to a part of the network before it was replaced by the second version (and its followup block).
And to make it clear: There is not 1 blockchain out there that has no orphans and all handle them by themself (see chain reorg).
Orphans are unavoidable and and part of the blockchain design is to handle them.