It’s less that Twilio specifically owns it than problems resulting from corporate ownership. Briefly:

1. You can’t get your data out of Authy. Actually you can, but it’s a long annoying process involving installing an out of date chrome extension and using developer tools.
2. Privacy issues. Authy links a lot of data including location to your identity.
3. Authy supports SMS account recovery (which is inherently insecure) and doesn’t allow users to disable it.

Android is easy, Aegis.

IOS is much harder. Right now, probably “2FAs”. Authy is owned by Twilio, Raivo was just bought out by an advertising company, and the others are either too small to get the exposure required for any level of security or charge for the feature.

I’m all for open source alternatives to bitwarden but this is non competitive with a mandatory subscription fee. Bitwarden is completely free for most users.