Every new pool will add in for decentralization, so that is to be appreciated. However, also anyone can decode the coinbase data regardless of the (solo) pool, since that data is exchanged via stratum. So there always was a way to verify what address is being rewarded with what amount (if the respective block wins) - and since the block hash is based on that input data, any tampering with the data will result in another hash value that won't meet the target difficulty.

Assuming on block level all is fine, you still have to always trust the pool operator to be fully operational, with up-to-date blockchain and capable to get your winning block out to the network as fast as possible. There are known and proven solo pools out there already, so as a new solo pool operator it will be hard to find trust and acceptance. In fact you can only earn trust with the count of solved blocks.