Does Thunderbird really loose users to Gmail or Office365?

Does Thunderbird really loose users to Gmail or Office365?

I know this is not an option for everyone, but I self-host my email. It costs me a bit more than $100/year, but that's OK because I use the same infrastructure for many other things.

My email infrastructure consists of:

• A KVM instance hosted in Montreal by OVH that acts as my MX host and email filter. I pay around $7.85/month or $94.20 per year for this.
• A Raspberry Pi 4 with a couple of 6TB USB drives as my actual mail server where all the mail is stored. This was probably close to $400 in fixed costs plus about $15/year in electricity.
• A similarly-configured Raspberry Pi 4 at my sister's place which is my offsite backup with similar electricity consumption.

My recurring costs are thus about $124/year but I have full control, full ownership of my data, and no realistic storage limits... I have email going back to 1989. My Pi 4 also runs other services such as Radicale for my calendar and contacts, Asterisk for my phone system, etc.

Another consideration for me, being located in Canada, is to minimize my dependency on US-based companies. Given the geopolitical situation, it's simply too great a risk for me to have my email stored or accessed by a US-based company.