In what way? Companies drop/move on from small customers all the time as positions and analysis changes. $5 a month might make sense now, but with thin profits, a lower than predicted "upgrade rate" and maybe a higher than anticipated support cost etc and this becomes a less profitable option without price increases, which loses customers causing more increases because of none scalable costs etc.

Throw in a change of leadership or business focus and it's an easy short term boost to drop the many smaller customers and focus on the big fish who make the real money.

It's a common pattern, echoed over many industries, and while you might not see it being likely here right now, if the concept literally doesn't make sense to you, you need to look up some basic business ideas because it's a pretty valid concern.