they are private name tags to make it easy to keep track of who's who. it's a pretty handy feature on bscscan.
This is on bscscan:

I wish there was a way to export these to Arkham, which is superior as it combines all major blockchains.
From what I know, it's also possible to create tags to identify addresses in Arkham. You have to create an account there.
I don't know if this information will be public or just private.
I get what you mean. I am only showing screenshot evidence without proof of address ownership for each account.
Some of the accounts hosemary spilled, as listed, sent BNB and USDT to the same address 0x12590130142d986539Ed0E7005Fbd98fC94f5571. Same for the two accounts I mentioned.
But how do you know that this address doesn't belong to some external service?
Yes, as a rule, services assign an address to each user and don't always use the same one.