A European visiting the US and interacting with an American business does so under the protection of US law, not EU law. This is complicated in the case of Facebook and google because they also do business in Europe, so European courts can fine their European branch offices. But Triplebyte has no such EU presence that the European courts could pursue. And they don’t advertise European jobs. I suspect an EU citizen interacts with triplebyte legally the same way they would if they went to a cafe in SF while on vacation.
The opposite would be crazy. If triplebyte can be fined by the EU, that would also mean the government of Australia or China or Russia could arbitrarily levy fines against any US company if one of their citizens interacted with a US website one time. And everyone would put geo blocks on their websites to protect from liability.
GDPR is very clear in wording that it doesn’t matter whether company has offices in EU or not, only thing that matters is if company is providing services to EU citizens.
Of course there is a question about how you could enforce such a ruling. And if it can't be enforced, is it really a sanction? I guess if countries wanted to take this really seriously, they could get a list of company officers and put immigration flags on those individuals, and hold them temporarily upon trying to enter that country, until the matter was resolved. But that would be rather extreme, and you do raise some good points around which countries can fine the companies of other countries.
CCPA from California seems to have some cross-border implications as well - perhaps we will finally see a framework for privacy laws that works better than today's hotch-potch?