They delete your forum replies just because they want to be the ‘First’ to reply or decide that your answers aren’t complete (i could give you 2 names, but i’d prefer not) and want to offer their personal paid services by linking to their professional profiles (yes..).
Wao kufuta jukwaa majibu yako kwa sababu tu wanataka kuwa Kwanza '’ kujibu au kuamua kwamba majibu yako si kamili (i inaweza kukupa 2 majina, lakini ningependa hawapendi) na wanataka kutoa huduma zao binafsi kulipwa na kuunganisha na maelezo yao ya kitaalamu (ndiyo ..).