You cannot be sure and yet Telegram often gets mentioned for being the only platform where states do not have easy access to user information or the ability to censor certain messages/content.

So from a broad perspective, they probably behave better than comparable services.

I think Telegram should not be trusted, but I also do not trust the alternatives, that readily share information with states. A special focus for me is that my own jurisdiction does not have access to my social media content. Other countries are secondary at first.