Apple has been fined the equivalent of $41 Million for deceptive behaviour regarding them using software updates to slow older iPhones down due to aging batteries in them to help keep the phones stable and from unexpectedly shutting down. Apple had applied the slow downs without informing users and the French Courts found that was deceptive by not disclosing at the time they introduced the technique. Apple revealed the slowdowns in 2017 and they still use the technique. The latest batch of phones potentially affected are the XS & XR series of iPhones. A user since iOS 11.3 can see the health of the battery in the Settings section and if throttling has been applied it can be disabled.
To see the SMH article on the matter:
Where is Australia’s ACCC on this matter?