

2 factor authentication via app/texting I’d imagine.
An authenticator app is better than basically anything but a physical token / key generator, but the apps are more universally supported. No one is probably going to spoof your phone number to get into your accounts… But doesn’t hurt to me more secure about it anyway.
In that case you’re going from, for example 50% and 50% to 49% and 51%.
If you just have 100 people in a room divided evenly, and one person crosses the line in the middle, one side of the room has +1 person and the other is side has -1 person. There’s a 2 person (2%) difference.