The were online a few hours ago (From a Starbucks with a burner laptop bought from craigslist and a VPN) so doesn't look like they're coming back, haha.
IMO true anonymity is probably nearly impossible. That said, you are one of billions online so the question is does anyone actually care about you beyond your value as a consumer (probably in aggregate)? Probably not.
If you really want to be anonymous get and use a live Linux system on a cheap laptop (Parrot OS), use Mac Changer to clone the Mac address of another PC that already has access to Starbucks Wifi, then start TOR and then use Annon Surf.