excessive use of colored text has been a kick-able offense in the past. So it stands to reason that over use of bold could be dealt with in the same manner. In general: if you are advertising your warp or trying to get a person's attention, it is fine to use colors or bold. Just don't use them for every chat line as that falls under the rule "Don't be annoying" and repeated offense after being warned or kicked can get you jailed, muted, or temp banned.
Just enough of a Bastard to be worth liking.