glances over at their supporters page [0]... I mean, that's not literally impossible.
While it is true that Mullvad supports at "Shallot Onion" -and has since mid 2023- [1] and "Shallot Onion" is Tor Project's highest support tier, we don't know how much Mullvad is paying. Six years ago, the smallest amount one could donate to get into that tier was 100k USD [2]. In contrast, just one of their eleven (or twelve, depending on how you count the two listed US State Department entities) supporters provided 500k USD per year in 2022->2024, and "committed" to providing 750k USD per year in 2025->2027... until -one assumes- DOGE canceled that grant in its "efficiency" sweeps.
FUTO is another of the eleven-ish entities on that page. While FUTO doesn't seem to mention how much it granted to the Tor Project, their grants page [3] claims that they've granted five million USD to twenty entities in their "Legendary Grants" -er- program, for an average of 250k USD per entity.
There's a lot that we don't know about the details of the financial situation of the Tor Project... but while it's possible that they become captured by Mullvad's money, it seems unlikely to me.
[0] <https://www.torproject.org/about/supporters/>
[1] <https://mullvad.net/en/blog/2023/3/3/mullvad-becomes-highest...>
[2] <https://archive.torproject.org/websites/lists.torproject.org...>
[3] <https://futo.tech/grants>