Earlier quoted context omitted.
This post reminds me of when I encountered people that were surprised to learn that the owner of a Telegram bot can read all messages sent to the bot.
Part of being an engineer is making products that act the way the users want them to act. The fact that a Telegram bot owner can see everything the bot does is not what most users want/expect, and is therefore an engineering deficiency. Obviously fixing this deficiency isn't easy...
I fully expect that when I send text to a service that the provider can read all of it. Like of course they can, they have to process it.