Ubiquitin is right that many Chassidic courts have always acted as royal courts. It’s personally not my cup of tea, but this is their mehalech in avodas Hashem. Rabbeinu Hakadosh wasn’t neheneh personally from his wealth, but his wealth was very much on public display.
TLIK is writing revisionist history about Chassidim. Yes, there were Rebbes who lived austere lives, but there were the other type as well.