This is true and is a fundamental difference between PiKVM and TinyPilot.
TinyPilot charges a yearly subscription for customer support and software updates because those things have ongoing costs.
I don't think small businesses can realistically promise customers free support and updates for life. It may work in the short term, but at a certain point, it's not sustainable for a vendor to spend their limited support and dev resources on customers who purchased hardware five years ago and will never pay the vendor another dime.