But without those 3 rounds, your company likely wouldn't have gotten to the $100M valuation. Sure, if you can get a company to a $1B exit without raising any funding and avoiding any dilution, that is the best case. But, in reality most companies need to raise capital to grow. You accept dilution because the value of your shares should go up assuming the company is executing well and putting the capital to go use (i.e. increasing the company value).

If the value of your stake goes down, you shouldn't just blame dilution. You should blame the company for performing poorly.