I get it, who wants to be tracked, recorded and monetized but the reality of it is they have so much on you just by owning and using their device that opting out here and there is pointless. Sure you say don't record my voice using assistant but later say it's OK to record your voice when you use Google Translate or some other app. I'm not saying that being cautious isn't prudent but in the end all we have is their word that they aren't collecting this data already and frankly they have all been caught lying and cheating too many times to actually believe them, IMO. Later they will tell you that certain things won't work or won't work as well if you don't, XYZ, whatever that ends up being. Letting them keep a 30 day record of your voice so they can offer you better service or make more personal suggestions to you and with AI rolling out on many devices it is only going to get worse or better, depending on how you look at it. In the meantime it comes down to do you trust them to do what they say or not? If not opt out, and avoid the service altogether. If so, trust they aren't recording you when you say "please don't" and use the service. Unfortunately we cannot guarantee making this change changes anything.
Just as an example if you've caught any of the coverage out of Georgia regarding the former president, if you really want to be concerned about privacy, look at how through and detailed they were able to be tracking Nathan Wade's cellphone movement from over 4 years ago. They could see what neighborhood he was in, at what time and for how long from over 4 years ago and that is just piddly little carrier. Now imagine Google or maybe we should try not to imagine what they know and from how long ago.
In the meantime best wishes and I hope your recipes come out delicious.