I really don’t think this qualifies as enshittification. There’s no evidence they’ve taken funding or have any shareholders they need to appease. They also only increased prices and have not moved the paid/free boundaries in any way.

I think it’s much more likely this is a side project that simply doesn’t pay for itself well enough, and the alternative would be shutting it down. If people aren’t happy with that, it’s totally reasonable to just cancel.

There are separate titles for accredited engineers in the US and UK. If anyone cared enough they’d already be using them. The fact is, vanishingly few software engineers work on high risk (to human life) projects. Versus, for example, structural engineers doing it daily.