CryEngine has (had?) fairly bad licensing terms overall but they're working on them (this OSS strategy is likely part of that) and they are nothing like the Lumberyard terms which essentially buy out your soul.
> 57.4 Operating Restrictions. Without our prior written consent, (a) the Lumberyard Materials (including any permitted modifications and derivatives) may only be run on computer equipment owned and operated by you or your End Users, or on AWS Services, and may not be run on any Alternate Web Service and (b) your Lumberyard Project may not read data from or write data to any Alternate Web Service.
I am talking about "serious games", because you aren't allow to develop them professionally with cryengine without written consent.
It was a word play to your "serious game developer".
this seems like a bit of a red herring. "locking yourself" is a bit under-specified - picking unity, unreal, cryengine, phyreengine, or whatever is also doing just this. choosing physx or havok is a fork in the road. etc. presumably one is making these choices after carefully evaluating options.