One thing they really have going for them is timely delivery of image data.
When I detect motion in my driveway I send them the JPEG through their API, without skipping a beat I get the image on all of my devices including my watch.
I tried email, discord, SMS, slack, pushbullet. Stuff either takes a long time to come through or comes through missing an image. I honestly hope they never shut down the service because I cannot find another service that runs as well. Fortunately for my needs I don’t care and the least about encryption.