On multiaccounting - A perspective
While this is in a certain way off topic for the forum, there is a constant theme of blaming wayfarer abuse on multiaccounting and then criticizing Niantic for not doing anything about it. While the abuse claims might be true, my idea is to present my impression of why doing something about multiaccounting isn't as simple as it seems.
The perspective I will present is centered on PoGo, which is the game I play. While I do have an Ingress account, I only use it as a wayfarer tool and I'm utterly ignorant of how the game is played.
The first thing you need to understand is what your typical multiaccounting looks like. Based on my community, this means having two accounts and play more or less regularly on both, using a dedicated phone for each one. Based on my experience during early covid lock down, before the interaction radius increase, when I was the designated grocery shopper and used to carry my kids phones with me so I could at least spin a couple of stops a day for them, there's no way to play simultaneously with more than two phones.
The use pattern of this kind of multiaccounting is probably easy to see for Niantic: two accounts moving together. Unfortunately, since two different phones are used how can Niantic be sure that they aren't two different people playing together? We do have husband and wife and siblings teams on our group that normally play together, not to mention me and my kids. Banning those people for suspected multiaccounting would be counterproductive, especially when low level multiaccounting (2 accounts) isn't disruptive for the game so there isn't much to gain banning it.
Then you have spoofers, which normally have at least a "clean" account and one or more used for spoofing. While multiaccounting is generally ignored in PoGo, spoofing is not and many groups, including mine, will ban you and kick you out if you're discovered to be a spoofer. Unfortunately, most spoofers choose a remote location and keep playing in that area, changing account when they want to change areas. While this kind of multiaccounters may have enough accounts to engage in wayfarer abuse, they're also more difficult to detect because their use patterns won be perfect matches and their phones are lying to Niantic servers about almost everything.
Finally, you have the guys who purchase inactive accounts. They might use several of them to influence voting but how would Niantic identify that two different accounts are actually the same person when the use patterns won't match.
So, in a nutshell, I think it's difficult for Niantic to take action against multiaccounting without unjustly punishment honest players.