The X4Y shape is a naming convention in its own right. The 4 stands in for “for”, and it’s been used that way in product and programme names for long enough that nobody has to work it out.
P4B reads as platform for business, power for business, or partners for business. All three describe live categories, and all three are the kind of thing a company would otherwise spend three words saying. Three characters does it instead.
The .net is the natural extension for a platform or service business, where the audience is professional and arrives by link or referral rather than by guessing an address. It carries no penalty in B2B and it keeps a three-character name within reach.
Beyond the reading, it’s simply short. Short survives phone calls, business cards, email signatures, and the narrow space a mobile browser gives a link.
Three characters, established convention, fixed supply. The name is listed.
Enquiries welcome.