I suppose I get less of this since I am not on Facebook and nor do I use Google.
However, there are things you can do.
I do have a Google account since I have an Android phone and an Android tablet. There is no way I can stop Android from tracking what I do on those devices I figure. Can't turn them on without being logged in to my Google account.
But it is not possible for Google to link that to my reading/posting on PRE, which I do on a laptop, unless I am using Chrome and logged in to my Google account. So, I sit here in Firefox, I don't use Google to search (I use Duck Duck Go) and if I do need Google to search, there is no way I am logging in. I also rarely check my gmail account, I simply don't use it and can barely remember the email address.
Plus, Duck Duck Go can install a privacy monitor in your browser which tells me what each site is doing - from this I can see PRE is a pretty good site, it has an encrypted connection and I have 2 trackers blocked (I think Duck Duck Go allows me to block trackers).
123Cups, I would suggest, at a minimum, that if you are looking at PRE using Chrome that you do not log in to your Google account while doing so. Then consider using a different browser (Firefox, Vivaldi are a couple that I use). You can use a privacy browser like Firefox Focus but that only makes it like a private window, records nothing on your computer but plenty on servers, so no protection from Google or Facebook there. The next step would be a private VPN, I have never used one so someone else can explain those.
If the large tech companies want my info to target ads then they can suffer as far as I am concerned.
DS