Great read from Tuta on thia topic. It's been an issue for a while but Google going full force publicly on it causes this issue to grow greater.
I left a comment replying to someone further down about how this can be at least a little combatted and how it is with browsers. (At least to my minimal knowledge of it)
I just wish Tuta put more effort into their product than their marketing.
I noped out because of them not letting me have any control over my emails outside of asking them for a dump. But reading the support reddit is just brutal.
I personally have never used them. I use Proton myself (despite some news) and haven't had any issues. I've heard Tuta is also great but I think one of the cons of privacy mail is that they're not going to be nearly as polished as the big players like Gmail or outlook.