It's still just a job. And at the end of the day, unless the company is giving me stock, the only thing that matters to me is whether the company still exists tomorrow. If I'm learning new tech on my own time, that's for MY personal enrichment, not theirs. Sure, I could spend my personal time dreaming up new ideas for the company, but I'm not inclined to spend a second of my time prioritizing them over my own personal interests.

I've built multimillion dollar success stories online and still been laid off as the only developer because they thought they could go into a "maintenance phase." Nobody ever again will ever get more of my time than I am compensated for.