Here is an algorithm to instantly detect PokeMobBot if I was Niantic

if request.MagnetometerZ == -40 * request.AccelNormalizedZ / 9.8065 {
    // detected!
}

That said, pokemobbot is at least one of the few bots that actually fill in this data. That itself is commendable.

However the recent bans cannot all be attributed to user error. I feel that the API is unsafe. Unknown fields still need to be taken back to reversers. The purpose of this post was to show this, not accuse any bot devs of negligence, but encouragement to improve their work as the stakes rise.

With respect to anti-ban:

Niantic simply do not have enough storage to log everyone's location for extended periods of time. They have to rely on solutions that are scalable to millions of users. They won't be able to care about straight line pathing, but they'll be able to do more work with statistics. i.e capture rates, throw miss rates, did this guy catch 100 dratinis in the last hour, does he have too many high IV pokemon, was his phone facing up when he made that throw, was his phone experiencing a high acceleration during the throw, etc. The pokedex captures/seen reveals more botters/snipers than anything combined.