If we can't ban spoofers, how about banning the sale of accounts on sites like ebay

It is too late for that, accounts are being selled anyway on the internet, there are too many spoofers and Niantic knows it. A lot of people is selling and buying accounts, even on youtube there is people giving away them in exchange of likes, comments, etc...

If they had a better customer service a lot of spoofers had been banned right now, they don't even answer or look at report emails, I have sent many of them, giving enough proofs that no one was actually there taking that gym at that time, all I got was an auto reply saying that they will look the case but I won't get an answer, lol it makes my laugh...It is like "Thank you for contact us customer, but we don't care, goodbye".

There is a pretty good video on YT of a group of guys filming a gym in the middle of a street at night, no one can be around, there are no buildings and no parked cars, it is in the middle of nowhere, and the gym is taking all the way down and 2 spoofers put a mon on there, they sent the video to Niantic a month ago, never got a answer, seriously? Those guys where filming the street and the pokémon app working on their phone at that time, showing more than enough proof to ban them forever, and Niantic does not do anything? When I saw it I could not believe my eyes.

Anyway, game will stay like this until it drops down that much that no one will buy accounts anymore and hackers will lost interest.

Most spoofers don't use bought accounts - they just play the game from a PC using an ordinary account.

The accounts sold on ebay etc. are mainly bot generated. Periodically Niantic do a sweep of these and close them down.

Home spoofers are probably very hard to detect if they're using the right APK.

I suspect the scale of manually checking accounts (you wouldn't want to ban someone on the strength of a malicious report) is huge. My small town in the UK has at least four obvious spoofers (one of whom has disappeared - possibly banned), multiply the number of small towns across the playing world by four or five, not to mention big cities...

Spoofers are problem.

Only solution is to find your team mates who are also spoofers.
But where to find????

We have to report spoofers on our own teams, too.
And the last guy i reported on i never saw again.