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There's no solid evidence of a spam attack, but I don't discount the possibility. Still, wouldn't being vulnerable to spam attacks be aan issue in itself? Spam attack or not, the network being clogged means we lose either way -- Bitcoin can't handle high demand and/or its network can be brought down by a few bad eggs. It's a weakness that shows Bitcoin isn't ready for primetime.
Interesting viewpoint, I never really considered that being vulnerable to spam attacks is an issue in
itself. I´m just speculating, but maybe it will become increasingly expensive to spam
the network when the Bitcoin price reaches new highs (after all fees are calculated in BTC and
the people with nefarious intentions are likely not having huge amounts of BTC, but rather huge
amounts of fiat).
Regarding evidence for spam attacks I could provide you with a few links:
Some analysis done by French developer LaurentMTSome analysis done by meOf course none of this is definite proof of spam attacks, but some blocks contain
a ton of transactions that are highly unlikely to come from legitimate Bitcoin usage.
Besides, some entities were obviously highly incentivized to try to destroy the trust in Bitcoin
(e.g. Bitcoin Cash supporters, some governments, Ethereum supporters, who were waiting for the
"flippening").
