[acdha]

Why the outrage? If they're promising support, charging makes sense and in any case: their code, their license. It's not like anyone is required to buy it and it'd cost you way more than $60 to duplicate it.

[MasterScrat]

True.

However, charging for this particular item is weird, because people who would use this library can figure out how this feature isn't anything hard.

Something more interesting could be eg to offload the heaviest computations to the clouds.