But again with that thought line and this strain of coronavirus, since you can carry it and by asymptomatic, it's going to be really hard for someone to prove exactly where they got it from.
Sure an employee could come in being sick with possibly this strain, but that doesn't mean they got it from them. Maybe a teen that's asymptomatic moved around to 8 different spots in a theater, then people picked it up from those surfaces, and then they bumped other people and next thing you know 30 people walk out of that theater coming in contact with it. This isn't like other health code items that's very easy to track. Salmonella which comes from most often undercooked food is easy to trace to a stand, what workers were there, and who did what. Given that something like a virus can come from an employee or a guest, it's unlikely that BGW (or really any park) would be able to be pegged as the sole reason someone got the virus.
Hence why testing and contact tracing is such a big part of reopening aspects of economies and they it's such a big undertaking. In your average day pre-pandemic, how many people would you say you come into contact (not physical just near) with? 50-150? Now each one of them does the same and that's 2500-22500 people that possibly came into contact with it because you were sick. Now do the same thing with BGW but assume the contact was a guest. That number could be the whole park quickly.
And something that lives on surfaces like this can lead to a 'false source' so to speak. The person with it pays in cash with a bunch of 5's for their lunch (extremely unlikely but this is for the point). 5-$5 bills into the till. Safe to say most the bills would be contaminated, then everyone that get's change from that. Even if they sanitize their hands between every touch of a bill and or coin it still would spread and it's not BGW's fault at all that happened. What if someone had it and went into a merchandise shop and touched 50 different things possibly contaminating the shop and all those things got either bought or touched by someone else. Yea if a cashier is sick some of the people that get it might come from the cashier, but there still could be plenty of people that never came close to that cashier that got it.
In the end there is a burden of proof that the person pursuing the lawsuit needs to prove that it was because something BGW did as to why they got sick, and I see that being very hard to prove with my non-lawyer POV examples there. It's why lawsuits off non-traceable illnesses are so hard to pursue. It's so hard to pin the source and know the exact origin of it.