It's pretty normal that number of users have grown and even the relative argument/argumentation.
You can't expect to have the same appeal likewise initial years without CEX (!) or even content/groups in local language.
Another point =
Bitcoin is a decentralized currency but it can involve many arguments. We can't talk about "detailed tech" applied to our coins all days all the time.
It would be boring. It would also not profitable since bitcoin isn't just math but it involves ALL arguments in the same time.
It would be an impressive restricted forum with just few people able to argue... it's a public forum. Menawhile some discussion have find passionate. This is a forum.
If you just think on the impact of predictive market in economy / politics = you can understand how it is GREAT the impact of technology like bitcoin.
I am not sure you're "really old" from this forum, unless you come like from 2010?
Signatures and promotion of casinos have been here since 2014 at least (the year I start to use the forum). In general there is also a real explanation why gambling has been much appreciated, has becoming part of the history of bitcoin. (Satoshibones - Gambling should be legal - Bitcoin = money! ---> its a long story...)
Spammy commercial post...
I had the worst idea to write on REDDIT the URL of the forum. I have been likewise blocked, you CANNOT TALK of the forum. You cannot post even the URL

If you read some post, there are Ai and bot, posting crappy content like there is no future in many sections, with comment masked by promotion.
What is worst, in some "financial section" if you mention bitcoin you get -25 downvote

in a matter of minutes
Isn't a commercial move to downvote post that promote bitcoin in a "personal finance" space?
[I am doing good investing buyng (ETF/STOCK) XXXX ? LOL

] You read the worst crap, you can't write
BTC---
Even for signature there is a long explanation. But these are exactly the opposite of what you said... if people spamming they will just get banned.
These have always been here. There is another explanation similar to gambling

section.
I am one of the first that has seen a clear change of the forum but I wouldn't see as completely negative. More people joined the space.
There is less spam than other places. There is an approach where you have to use your brain and not just be guided like a sheep.
Users try to keep a kind of etiquette, even intellectual honesty. At the end, the hours involved and the effort to read some useful post are ... priceless!
You get free info, you get valuable info, free support, free share of idea.
Of course there is a "Balance", we can't remain like a group of old man talking about "a mistery innovation".
But for sure its evident we as community, as bitcoiners, as honest humans, we must keep our attention "ON" to avoid any potential problem.