The depreciation of v2 addresses is the best course of action in this case. v2 addresses consist of the first 80 bits of the SHA-1 hash of the hidden services 1024 bit public RSA key. This sentence alone is enough to make any cryptographer cringe, it is really bad! (SHA-1 has been shown to be broken and it is suspected that 1024 bit RSA can be cracked by any determined well funded state actor)

Also, Tor Project has had v2 address depreciation on it's roadmap for 2 years now, they have given hidden service operators plenty of time to prime their community for the v2 --> v3 switch. This gradual change is way better than scrambling to depreciate v2 addresses in response to some state actor publicly breaking the RSA keys of v2 hidden services.

> I thought I owned my tor domain

You may now, but if v2 is kept around soon you won't be the only one with the domains private key.