How gimped would the treadmill be without a subscription?

I absolutely despise Peloton and everything they stand for as a company but unfortunately the Tread + does seem to be the best value for a motorized slat treadmill.

Can I do anything beside turn it on without a subscription and if not what's the current state of sideloading apps on the tread +? Happy to do whatever modifications I need to be able to just have the basic functionality (ie local metrics and a few programs) without needing to pay their absurd fees or ideally have to keep it online.