These are the benchmarks to go by. There is no question that a person has influence simply by virtue of having access. That said, unless there is a reasonably clear quid pro quo, it is much to do about nothing.
When it came to RBG, one assumes that most leftist leaning people would be happy to pay for her fare to have her around and discuss things because they supported her general progressive philosophy, not because they were actively seeking to flip her on a particular case. Same with Thomas.
Back when I used to run the GOP, I used to co-host a monthly soiree (aka poker night) regularly attended by city council members, judges and state senators, head of the major crime bureau, etc. Both sides of the isle. We all had a fun time and we supplied plenty of top shelf alcohol and cigars (they never paid). We certainly talked about things, judges always knew not to discuss current matters before their bench, pols discussed things as well. Do I think anyone felt obligated to change their vote or opinion because of these? no, but maybe we changed some opinions through open discussions.
Now I have a good friend who was a state supreme justice and sometimes he would talk about cases before the bench when we were having a private cigar but only in the most general way. More likely discussing the issues around the case than the case itself. I already knew how he would typically come down in most cases anyway because he was my friend and I know his philosophy but sometimes he did surprise me with some cases I heard about how he had ruled on.
Fly you to bahamas with me to stay the weekend and have a few drinks, etc. Lets go hunting in Nebraska, etc - Ill pick up the tab. So that kind of thing is just going to happen. Hey, I have a guy who can repair your boat and redo the dock on your vacation home, dont worry Ill pay for it - thats where you start getting in trouble.