Are this Hackers trying to proof their capabilities, or something?

[Crwth]

Maybe they are just now exposing the possible bugs and want bounties. I’m not sure if they could be classified as white hackers; maybe they are still on the grey side.

It could be a show of skill as well, so better watch out for those who are operating businesses that have large amounts of money

[MUGNIA]

I am just wondering because we hardly hear of hackers returning their stolen funds this days.

Yeah, it's definitely unusual move. But i would speculate it's partly because difficulty of spending or laundering coin they stole effectively.

but they can also just remind that there is nothing unsafe on every platform or various blockchains, all can be taken over by people who are indeed capable in this matter, the problem of money laundering from hacking can also be the reason they return funds where as we know they hacked will not be able to be sold or diverted in short time , what's more on local exchanges they will be detected by the exchange, it's the same as them surrendering themselves