Why so many bans when they can do permanent ones?

[Zaytron]

I'd like to ask for what you guys feel about the bans.

There's so many different type of bans now, pokestop ban/flee ban/soft ban.
So why does Niantic want to implement so many bans when they can just do permanent ban for each causes of those ban.

Are they uncertain that it might affect innocent users? I'd like to hear your opinions.

[Ripper3]

They do not want to instantly perm ban anyone, who might have hit one of their limitations, as they need to be sure it's justified. So when the server detects a possible bot, it will softban that account and see what happens. If the account keeps getting flagged over and over, it will eventually get perma banned.

It's a safety net, to make sure, only the accounts that deserve getting banned, get perma banned.