I promise you 99% of people have never heard of them.
That doesn't mean they didn't help increase interest in classical music. Ask anyone under 35 who's into classical music if they heard of Two Set. These channels definitely made an impact, especially through TikTok form. Anyone who was 1% classical-curious, TikTok would hook onto them.
Do you have a grasp on fractions and percentages? If exactly 99% people have not heard of you, you are incredibly famous.