Will spam make the Bitcoin system sick, like a tumor? Just like many people are willing to spend a lot of money to eat junk food, and finally lead to a higher probability of cancer in the body. Nothing bad, just a worry. 😉
Spammers need to pay like everyone else. Bitcoin doesn't use white blood cells, or any cells, so it'll be fine.
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Will data bloat lead to congestion and slower transactions
No. It's the nodes that are affected as they are the one retaining the data. Transactions won't be slow down.
There is no spam at the protocol level. Only valid transactions. Individual users might consider certain transactions as spam. But that's personal.