Each instance stores post thumbnails locally even if the post was on another server. It actually takes up quite a bit of hdd space.

I’m more talking global purchases. Just the email will probs be ok but if you purchase using that email and a vpn it raises flags.

I’ll be honest, when it comes to online purchases you may find that a protonmail email will require extra processing/fraud checking due to the amount of fraudsters that use it. Combine that with a vpn and it will just be a pain here and there with online purchases like additional ID verification/delayed orders etc…