信用卡好像是必须的？

[aylitat]

似乎没有信用卡，不能注册

[Firevvork]

No, it's not necessary.
The first 150$ credits don't need credit card billing.
Only when applying for 300$ credits, you need to submit credit card information to Google Cloud.

[cg-dot]

It seems that eligibility for the $150 free credits depends on the reputation of your google account or IP.

似乎你的 Google 账户或 IP 的信誉会影响你是否有资格获得 $150 美元的免费积分。