Having owned UDM for over a year with auto update off, they never pushed any forced update, I always do it manually every few months. Based on number of updates[1] that they push I can totally give them benefit of doubt that it was a bug.
They have dozens of products which they update constantly, picking one bug at one time as malice and blacklisting a company is not correct. If you go that route you won't have any company left to buy from.