I've always found Whatsapp a terrible name, but its so established now that 'apping' is understood. If you're big enough it seems that a bad name hardly hold you back.

"To whatsapp" is a common verb, but I have never heard anyone say "apping".

Where do you live where "apping" is understood?

Can confirm that it's an extremely common verb in The Netherlands.

https://onzetaal.nl/taalloket/appen-whatsappen-vervoeging

Heard it many times in the Netherlands.

Reminds me of the old joke:

After Bill and Melinda Gates have their honeymoon, Melinda says, "Now I know why you call it Microsoft."