The other comments provided a great overview, but I would really recommend read ProPublica's reporting about them [1]
Some very brief highlights:
- They use dark patterns and other trickery to prevent people from filing for free (the vast majority of Americans can file for free via IRS free-file), instead directing them to the "free" up-sell laden product
- Lobbying against literally anything that would make filing taxes easier or cheaper. It doesn't have to be this way (and it's not in many countries), but it's how they make their money.
Some very brief highlights:
- They use dark patterns and other trickery to prevent people from filing for free (the vast majority of Americans can file for free via IRS free-file), instead directing them to the "free" up-sell laden product
- Lobbying against literally anything that would make filing taxes easier or cheaper. It doesn't have to be this way (and it's not in many countries), but it's how they make their money.
[1] https://www.propublica.org/series/the-turbotax-trap