As a result, I would guess a lot of Twitter's engineers are working on infrastructure, internal tooling, and moderation.
Regarding your example, doubling the size of a tweet, that was probably more work than one dev writing ALTER TABLE tweets MODIFY tweet_text VARCHAR(280). In fact, I don't know if you were around 20 years ago or so, but there was a similarly scoped project to double the number of digits we were storing the year in. ;)
The vibe that comes off is more of a social hangout club than a serious tech company. You meet your friend for lunch and there's professional chefs cooking gourmet meals, you hang out in the social area while the celebrity of the day comes into the office and everyone takes pictures with them. There's breakout rooms where people are filming marketing videos. The people that are hanging out talking to celebrities all day are making $200,000+ somehow. Anyone with right of center political views is casually censored from the platform with no recourse, because it's a "cool social hangout platform" not a serious technology product with mature guidelines of what acceptable speech is and formalized appeals processes. There won't be any productivity loss from everyone going remote because nobody is doing real work anyway.
I've been having very productive conversations with someone on twitter whom I'm pretty sure is a Catholic fundamentalist. I'm specifically following a few other accounts because the provide outside-filter-bubble views, and they're all rather further than "right of center." Haven't heard a peep from any of them about Twitter censorship.
TL;DR: Not sure what you're talking about here.
That's just not true - Donald Trump hasn't been "casually censored", neither have any of the GOP representatives who have Twitter accounts.
If you say abhorrent stuff, then yes, their platform, and they can say "you're not welcome here", but just look at the cesspit of comments on the recent "gate" hashtag and you'll see there are MANY right of center (some cases miles right of center) voices on there.
You have a persecution complex. Almost every conservative political figure and media personality has a twitter account that they post regularly on. Only a small number of abusive psychos (e.g. Milo) have been banned for breaking Twitter rules.
As someone half/two-thirds of whose twitter reading is right of center/right wing people, I find this comment perplexing?