Getting paid properly is important of course, but intrinsic motivation (of which a sense of autonomy is an important driver) is very important to keep workers happy, independent of whether they're doing crowdsourcing work or just a regular job.
I find it hard to believe that this platform will be competing against Amazon Mechanical Turk on price, so they'll have to compete in other dimensions. Increasing worker motivation to improve the quality of the output is a win-win for all the stakeholders, so IMO it's worth pursuing.
Good luck convincing workers that they are self-actualising while transcribing financial records from hard-to-read receipts.
If you are running a team doing this sort of work, it's better to be straight up with them and say "you know, this work is boring and repetitive, but we have a good team, look after each other, and you can listen to a podcast at the same time".
I find it hard to believe that this platform will be competing against Amazon Mechanical Turk on price, so they'll have to compete in other dimensions. Increasing worker motivation to improve the quality of the output is a win-win for all the stakeholders, so IMO it's worth pursuing.