If Chromium becomes incompatible with privacy, the only real and broadly accepted alternative is FireFox.
Which implementation, and as always in these kinds of discussions, that depends on your threat model:
On desktop, I am very happy with LibreWolf. Mullvad Browser is also great, especially with Mullvad VPN, though it breaks pages a little more often than LibreWolf.
On Android, I am quite happy with IronFox.
If Chromium becomes incompatible with privacy, the only real and broadly accepted alternative is FireFox. Which implementation, and as always in these kinds of discussions, that depends on your threat model: On desktop, I am very happy with LibreWolf. Mullvad Browser is also great, especially with Mullvad VPN, though it breaks pages a little more often than LibreWolf. On Android, I am quite happy with IronFox.