There's also a Base64URL variant that is a little more friendly in the modern world where the +/=
often need escape sequences.
The first two are replaced with more sensible characters and the third is just removed entirely - do you really need padding?
They might want to, but it's illegal.
The "quiet period" is a reference to an SEC law that forces any company to be radio silent for a strict 40 day period during the IPO process. Reddit is in that period now and therefore they cannot say a word.
JPMorgan was fined almost a billion dollars for answering questions on a phone call during their quiet period.