Its not yours because its a matter of community consensus. The community votes for or against your "dividend" as you do the rest of the community. Again, the only reason voting exists is to award contributions rewards from the pool to others, if it was simply about awarding yourself theres absolutely no point to voting or having a reward pool.
what's the difference between self-voting and self-tipping ?
One is an oxymoron, the other is self aggregating behavior that devalues the function of distributing rewards.
functionally identical
Not at all. When you tip yourself you give yourself money you have. When you upvote yourself youre trying to take money that is not yours.
how is your dividend, based on YOUR OWN STAKE
somehow NOT "your own money" ?
Its not yours because its a matter of community consensus. The community votes for or against your "dividend" as you do the rest of the community. Again, the only reason voting exists is to award contributions rewards from the pool to others, if it was simply about awarding yourself theres absolutely no point to voting or having a reward pool.
all stakeholders are contributing to the value of the token
No they don't.