Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
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Well, you're paying for increased privacy in money and (imo) security.
I begrudgingly stick with gmail every time I consider otherwise, and having one of the world's biggest IT security teams keeping it safe is one of the reasons. It's unfortunately how much they get to harvest my data, but I suppose I'd rather them than a scammer.
I don't see how an encrypted service like TN or PM would be less safe than gmail. Quite contrary. Leaks so often come from insiders.