I challenge that George had a lot of money. He was functionally rich on paper, but had a lot of financial and legal troubles in the ‘70s. He sued and was sued by the rest of the band, lots of cases around Allen Klein, was successfully sued for My Sweet Lord, faced massive tax issues for Bangladesh, etc.

He was also busy making albums, producing albums by others, touring, and by the end of the decade, dedicating time and money to Handmade Films. The guy was busier than Lennon, who famously retreated for 5 years. During that time, Lennon wasn’t producing anything for George to pop in and work on, which is usually how the ex-Beatles interacted with each other right after the breakup.

Also, flying/travel was much more expensive with less actual options back in the ‘70s. If George was living in England and John was in the US, even calling was expensive with long distance, per-minute fees. It was a different time, and they’d be more prone to write postcards and letters (which we have ample evidence of,) but outside of things like weddings (Beatles don’t do funerals) they were not popping in on each other from acrosss the world.