Edit: If this is actionable, I would be interested in participating in a class action suit against Philips for materially altering a product’s functionality after purchase. This is like buying a normal car and being told a year later it was given a remote update and now can only use Ford (tm) brand gasoline which costs $10/gallon.
If you do have an existing investment in Hue products, I suggest reaching out to them to request a refund because your purchase was made under a different policy, and this policy change is going to render your products useless without consent on your part. If they’re going to force a significant change that compromises the functionality of what might be hundreds of dollars worth of equipment without permitting recourse for legacy users, they should have to accept returns on what essentially is now a product you did not purchase and would not have purchased.