Lemmy has quite a few unfortunately invasive qualities of its own, including generally needing an email address from you (Reddit does not), having poor privacy and data retention practices, and generally being very messy with who gets to decide what happens with your data and how easily it can be scraped.
Sure, Reddit sells it… But Lemmy gives it to any web scraper for free.
…And attitudes like this towards privacy will keep Lemmy from progressing to a point where those issues will be fixed.
I have a fundamental problem with giant corporations scraping user data without user consent. That’s a system-level issue. It doesn’t become “good” just because they get to scrape without consent for free.