1/ It's still an early-stage startup, so you will be expected to own your role. At least it was in my case. I was the single Marketing, Communications & Community person for Onmeta. The grind is great if you are young & hungry, but not if you want a stable & structured role. This too can be a 'pro' depending on your mindset.
2/ Unstable industry: web3 - involves unexpected regulatory nuances, industry shifts, etc
3/ No benefits- no health insurances, bonuses, etc (might be different today)
4/ A little reluctant to spend money in marketing, growth experiments. Growth isn't always "hacked". Attention is commoditised, so you can spend your way to it.