At first I thought this is about letting random users transcribe 2 voice messages a week.
That would have been very weird and uncomfortable, but this limitation makes me think that the messages are uploaded to a transcription service.
If it would be run by Telegram, that's not really a problem as they already have access to the message contents, but if it's through a 3rd party.. how can I disable this for anyone for my messages?
Also, I expect this limitation to later be eased for premium users.