You are over-reacting. It is not completely Lexus' fault that your vehicle's Enform services are being phased out.
Your Enform services run on a 3G cellular network. As the letter says, more and more cellular providers are dropping 3G networks (to evolve and support 4G and new 5G networks). As more 3G networks are phased out, Lexus will not be able to offer your particular Enform services nation-wide; and in the foreseeable future, as 5G networks become the norm, 3G networks will likely be dropped altogether, by all providers.
Instead of having your knee-jerk reaction kick a dent in your beloved Lexus, have you researched what options there are to continue with similar services in 2 years time (October 31, 2022), when the cancellation becomes effective? The cancellation is NOT immediate, so you still have time to find another service. Perhaps Lexus itself will offer something.