What would happen if Ledger went out of business // Ledger Live was discontinued?

I have a hardware wallet, but I am pretty dependent on Ledger Live. I have a few other accounts (e.g. ADA) where Ledger Live isn't supported so I use another wallet and then have the keys stored on my ledger, which I understand, but if Ledger Live were to disappear, or Ledger go out of business, etc. etc. then would I still have access to my coins even if I "have the keys" but not an interface to trade / transfer them with?

Furthermore, is it not possible for Ledger to block you from accessing Ledger Live? How much control do they have in this? Obviously you have the keys but it seems like I can only move my crypto using Ledger's software so I'm still under their thumb, no?