Different courts have ruled differently on that issue. Note that it's mainly applicable to foreign defendants, and you'd have to show that you can't serve them

Different courts have ruled differently on that issue. Note that it's mainly applicable to foreign defendants, and you'd have to show that you can't serve them through other channels. See https://blog.ericgoldman.org/archives/2019/05/court-rejects-service-of-process-via-amazon-messaging-noco-v-chang.htm https://blog.ericgoldman.org/archives/2019/05/court-rejects-... for a court finding otherwise on a similar case. If you're running a business, there's different expectations.