Sim Card Data throttling explanation

I’m googling for some sim cards for long term stay in Japan.

I have seen cheap option like Jmio, His Mobile etc.
Before purchasing I looked up this subreddit for reviews and found they have some strange data throttling that’s confusing me.

Can somebody explain to me what the usual 300MB/3 day cap is about???

Why the heck would someone buy for example 20GB data plan if they could only use 100MB high speed in average per day???
Am I not understanding something here ?

by svaamlierna

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