Generally this is how liquidity works. Their employees will have a six or twelve month lock up (six being most common).

Investors in certrtain rounds (or sizes) tend to have no lockup, whereas later stages have a six month. Alternatively, I've reviewed agreements where the lockup is based on minimum market cap, but I've only seen that a couple of times.

This is just a general practice that always happens when paying in stock. It's to prevent a massive dump the next day which would tank the share price 'artificially'. Again, rich people's rules.

It can be inferred because it’s how things tend to work.