1. Perhaps what he loses is ever better than what he gains.

ever 和 even 都可以修饰比较级，都是加强语气。区别在于：ever 强调 “时间” 意义，意为 “越来越；日益”。 even 强调 “程度”，意为 “甚至更；愈加”。

even 修饰比较级很常见。关于 ever 修饰比较级的例句：

1. He grew ever more fierce in his demands.  

他的要求变得越来越强硬了。

来自柯林斯例句

2. Situation has become ever more serious.  

情况变得越来越严重了.

来自《简明英汉词典》

3. I think the amount of work will increase and that it will become ever more complex.  

我想工作会越来越多，而且更加复杂。

来自柯林斯例句

2. Many countries have laws limiting what use employers and insurance companies can make of such information.

这个句子的结构是：在 limiting 之后接了一个名词性从句。what 没有疑问之意，它是一个“融合性关系限定词”，引导名词从句，亦叫名词性关系分句，又做了use 的定语。what use = any use that

what use employers and insurance companies can make of such information.

等于：any use that employers and insurance companies can make of such information.

这里，use 是名词，划线部分为定语从句。that 指代 use，从句中是个 make use of 结构，use 是 make 的宾语，由关系代词 that 充当。

Many countries have laws limiting what use employers and insurance companies can make of such information.

【翻译】许多国家都有法律限制雇主和保险公司对此类信息的使用。