It tends to happen with startups I think because developers know the startup is likely not going to be around for long, or they will move on in a couple years a

It tends to happen with startups I think because developers know the startup is likely not going to be around for long, or they will move on in a couple years anyway. So why not shoehorn whatever tech you want and have that skill in your resume? Of course now the startup will need to hire for that tech when you leave and the cycle continues...