Unfortunately I have a Sonos system which became effectively bricked unless I signed a new user agreement allowing the collection of data. There are no physical controls on Sonos so the system becomes useless without accepting.
They used to sell dedicated controllers/remotes years ago but these were also bricked as part of an upgrade about a year or two ago. Unhappy owners were offered a voucher (worth less than the value of a single controller - many users owned multiple in order to fully support multi-room - see https://en.community.sonos.com/controllers-software-228995/s...) for their next Sonos purchase rather than allow them to continue to use the hardware they had purchased and used happily for years.
All concerns, requests to be allowed to downgrade, etc. are met on the official forums with a passive-aggressive dismissal of users' concerns by staff backed up by a few cultist fanatics.
I've tried to avoid any further updates (and deny Sonos access to my listening habits) by having it run on a disconnected network but if anyone accidentally updates the app on the old ipad we use as a controller, your forced to update everything. I just wish I had the same system which I originally bought which I use exclusively to play my ripped CDs from a NAS.