I don't see how anyone can trust them to control more than one out of email/search data/phone operating system/online identity. They're an ad-funded media company - there is not a track record of high standards in this space once people start flexing editorial muscle. And taking the chance of losing access to multiple fairly important communication channels at once is just needless risk. They're too big to trust.
Likewise, you won't blame Clubhouse for closing their product.
But Google did close some very used products, with tons of momentum, among my favorite are Picasa and Reader.
That's what happens when you make a collaborative tool invite only and severely limited the number of invites you can send out. What a truly bizarre choice.
Not surprising. A duopoly is little better than a monopoly. This is why we needed other viable platforms - which we had in Blackberry and Windows Phone - but didn't support them enough so we lost them. And here we are, caught between Apple and Google.
Consider supporting GNU/Linux phones (Librem 5 and Pinephone), which support desktop Linux apps.
How do you handle the fact that supposedly most large email corps mark your emails as spam?
I'm not currently getting blocked by Google or Microsoft, and maybe that's because it's hosted via my home connection (and therefore not within a set of known untrustworthy IP addresses), but Mailu has an easy path to ensuring SPF and DKIM are setup, which add legitimacy to the email domain.
I've been testing with a domain name that I haven't used for email before, so it's a clean slate, though I'm not sure how much difference that makes in getting blocked or not.
I've configured Postfix to use it for fallback if I can't deliver directly.
I use Digital Ocean and seem to struggle a bit delivering directly. 60 emails this month had to be delivered through mailgun since direct failed. Their free tier is up to 1250 emails per month.
Something that I very much enjoy is that mailinabox comes with nextcloud installed, which it uses for its exchange activesync calendar. I can sync everything from my keepass database to contacts and reminders to my mailinabox across devices.
The duopoly of having Apple and Google control the entire mobile universe is gut wrenching. This developer is now unable to develop for millions of phones based on an algorithm deciding they were a bad actor and Google likely won't be compelled to care, a drop in the vast ocean of their concerns.
There aren't any alternatives for commercial or monetary apps. I've taken to using finds on f-droid for mission critical mobile applications but that's just not viable for most people.