A very real risk.

Make time to check them if it's important or be clear that it's a dead communication line if you can't maintain it. As a fellow ADHDer I've had to back out of a few different platforms because I simply can't allow myself to engage with them - if someone @s me on Facebook I'll see it in six months to a decade... I do try and make sure my contacts all have good lines to me if they need to reach out, though.

And anxiety because my phone is telling me there's some incomplete task!