Meh, not really. The risk with making it publicly available is that a nation state or leet hacker types can comb over it and find exploits or know what libraries/etc you are using so when a zero day pops up they can target you directly. Whereas without direct access to th source code they'd have to do their own enumeration and surveillance.
There is some security through obscurity.
Also, just want to point out: being open source doesn't mean it's more or less secure. There is plenty of vulnerable open source code out their.
I switched from Nvidia for amd for the same reason: "and is better on Linux".
In my experience you are just making different tradeoffs. I use pop so your mileage may vary but Nvidia was easy to use and upgrade. It's not nearly as bad as people let on.
AMD on the other hand isn't as seamless as people let on. And the open source drivers, while awesome, don't let you take advantage of the codecs for video streaming or even alot of the AI ML stuff, so you switch to the proprietary drivers and they are slightly buggy.
I wish I kept my 3070ti over the 6900xt.
Unless they figure out a way to let me use av1 or rocm more easily then my next card will be Nvidia again.