I mean if u go to tiktok all u will see is one piece copy and stuff hating, tiktokers usually have a Tendency of never using the availability of brain but this one shows how impressive a guy who has 0 motivation of using brain and has sole motive of hating and as the bandwagon effect goes, sheep following sheep.

The Similarities of one piece and mysterious city of gold was in discussion long before tiktok was even main stream.
From my knowledge mysterious city of gold used to air in tv when oda was just 7,8 yrs old

The mysterious city of gold is a story being told from 16th centuries
It has different names
Such as El Dorado as for city of gold

The King's Fifth (1966) a popular novel about city of gold written from different historical tales about El Dorado

And later mysterious city of gold came around 1982
(King's fifth was a inspiration for mysterious city of gold)

So on the one piece copy thing don't fall for tiktok dumbasses
From what I see from my research the reason one piece has quite few similarities is coz oda took the inspiration from the same story being told from 16th century
For early anime story that slowly builds up to where it is now we know oda takes inspiration from mythology,historical tales, legends, folklore and stuff time to time so the mysterious city of gold is no different js a Inspiration that oda used in his way to tell his story