There's one main event, or, more accurately, process: the process of "getting worse". Within that main idea you have multiple events, each of which is worse than the previous one. It is present time.
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nicolas123Publishing books is getting slammed by the internet.Could we say that we have multiple events, each one is stronger than the previous one?No. Just multiple slamming actions. 'slammed' is not the comparative of an adjective like 'worse' is, so the idea of "stronger than the previous" (increasingly strong) doesn't apply here.
nicola