51% attacks happen quite regularly on smaller PoW blockchains.
Networks like ETC, BTG, BSV always face the threat and are regularly hit.
I'll let you Google these chains for some details.
As for Bitcoin, the network is too large and its hashrate too well distributed to be hit.
It's just too expensive for a bad actor to garner the resources to generate the hashrate required to pull it off.
Finally moving back to Monero, what makes this one so interesting to me is that while Monero is technically just another relatively small network, in reality is represents so much more.
As the leading privacy coin, Monero is essentially acting as a case study for crypto moving to the next level.
In my opinion, the fungibility that privacy coins like Monero offer is going to play a key role in the mainstream adoption of crypto over fiat.
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