Let's Encrypt is run by a nonprofit organization [1], funded by corporate and individual sponsors (like Google and AWS, but also the EFF and Mozilla) [2].
That doesn't guarantee they don't have malicious intents, but it's different from a for-profit company that tries to make money with you.
That doesn't guarantee they don't have malicious intents, but it's different from a for-profit company that tries to make money with you.
[1] https://www.abetterinternet.org/about/
[2] https://www.abetterinternet.org/sponsors/