UBI isn’t one policy. The hard right want to use it to voucherise public services and punish single parents. Tech wants to use it to giggify work. Social democrats want to use it to make benefits cheaper and easier to distribute. Socialists are still mostly suspicious but it could be used to force employers to behave themselves. Any version of UBI will struggle to ensure that it doesn’t make immigrants even easier to exploit (and some of those with the power to implement will seek to make sure this happens).

I am in favour of a socialist UBI which works well for immigrants too but it is extremely unlikely that any such thing will be implemented in this current reality. So, I am not against UBI but I am very wary of how it might be designed to work in practice.