Follow up question: are internet chat rooms / websites different from, say, your mailbox or your phone? e.g. should it be OK for me to crapflood you with postc

Follow up question: are internet chat rooms / websites different from, say, your mailbox or your phone? e.g. should it be OK for me to crapflood you with postcards that say 'today is your last day on earth, I will rape and kill you tonight'? Or send you texts (from different numbers via Twilo, naturally) that say the same, but with fundamentally worse grammar due to length restrictions?