Yeah, basically it was a bit impossible 51% attack happened on major coins (at least nowadays) with a lot of spread miners, but what impossible on this earth, right? It was quite hard for personal miner nor even pools to reach more than 50% of Global Hashrate on the major coins network (that was an expensive thing to do)
There you can look for a collection of coins and the theoretical cost of a 51% attack on each network !
The big four only available under 15% (on NicaHash). Will be better to do solo mining instead of Attacking the network . IMHO That was a good reference, by the way.
haha thanks my friend thats a big compliment, happy you enjoy my work! Hope the vacation was great
Unfortunately it can still be extremely lucrative to attack the smaller coins, even ZenCash which is not even a top 100 crypto on CMC netted them over $600,000 USD